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あの時「もっと◯◯を勉強しておけば!」と思った話 by エルピーアイジャパン Advent Calendar 2025

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Category:Present

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@Qiita

概要

このカレンダーでは、「もっと◯◯を勉強しておけば!」と思ったエピソードを募集します。

  • Linuxコマンドを知らず、クラウドの障害時に何もできなかった
  • 時間のかかるSQL文を書いていたせいで、運用に迷惑をかけた
  • 生成AIに書かせたJavaScriptが理解できず、レビューで怒られた
    などの体験を通じて、「どう学び直したか」「どう成長できたか」をシェアしてください。

対象となる技術は、Linux、PostgreSQL、HTML、JavaScript、CSS、kubernetesなどのオープンテクノロジー限定。
また、技術者認定資格の取得を目指したエピソードも大歓迎です!

あなたの “学びの失敗談” が、ほかの誰かのスキルアップのヒントになります。

こんな人におすすめ

  • インフラエンジニアとして成長を目指している人
  • データベースエンジニアとして成長を目指している人
  • アプリケーションエンジニアとして成長を目指している人
  • クラウドエンジニアとして成長を目指している人

参考記事

記事投稿ルール

  • Linux、PostgreSQL、HTML、JavaScript、CSS、kubernetesなど、オープンテクノロジーの学びにつながるエピソードであること
  • 本ページのカレンダーへの参加登録をしていること

参加方法・流れ

①本ページのカレンダーから、投稿したい日付の「参加する」ボタンをクリック
②期間中(2025/10/31〜2025/12/31)に記事を投稿
③2025/12/31までに記事とカレンダーを紐付ける

※過去の日付に遡ってカレンダーの登録・投稿・紐づけも可能です。

プレゼント

LinuC賞 1名

nwm(ヌーム) ワイヤレス ヘッドホン オープンイヤー型 nwm ONE MBH001 耳スピ

OSS-DB賞 1名

Anker Prime Power Bank(27650mAh, 250W)

HTML5プロフェッショナル賞 1名

Anker Prime Power Bank(27650mAh, 250W)

本キャンペーンはQiita株式会社による提供です。
本キャンペーンについてのお問い合わせはAmazonではお受けしておりません。
Qiita運営スタッフまでお願いいたします。
Amazon、Amazon.co.jp およびそれらのロゴは Amazon.com, Inc.またはその関連会社の商標です。
ーーーーーーーーーー
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Eメール : [email protected]
営業時間 : 土日祝日を除く午前11時~午後7時
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選出基準

投稿ルールに沿った記事の中から、「基礎技術の知識が不十分だったことに気づき、学び直した具体的なエピソード」、あるいは「体系的な知識の必要性に気づき、技術者認定資格の取得を目指して学習した具体的なエピソード」が記載されており、読者にとって学びとなる記事を選出します。

受賞者発表

受賞者はQiita運営チームより、2026/1/16(金)にライブ配信で発表。
後日、Qiita運営チームより受賞者へ2026年1月下旬ごろに発送先確認の連絡をいたします。
発送先確認後、順次発送いたします。

※ライブ配信以外にブログでも受賞者を発表
※キャンペーンの流れについて、一部、変更になる可能性がございます

PR

LPI-Japanは、Linux技術者認定「LinuC」、Webデベロッパー認定「HTML5プロフェッショナル」、PostgreSQLをリファレンスしたデータベース技術者認定「OSS-DB」、kubernetes技術者認定など、IT技術者たちのスキルを証明する認定試験を開発・運用するとともに、コミュニティと連携して技術習得に役立つ教材をつくり、技術者の成長を支援しています。

2025年12月には、エンタープライズレベルのLinuxシステムを構築するために必要となる高度な技術力を持ったスペシャリストの能力を認定する「Linuxレベル3プラットフォームスペシャリスト」と「LinuCレベル3セキュリティスペシャリスト」をリリースしました。

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書きますー!!

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なんか書きます

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ハッカソンの時の話

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何価格

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Linuxコマンドも知らずにセキュリティエンジニアになった話

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GitHub上の機密情報は消えない〜Webhook URLを公開してしまった末路〜

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PythonではなくJavaScriptを最初に勉強していれば

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アプリケーション開発者でもインフラの知識が必要だよと思った話

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2627
  1. Overwrite

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  13. 書きますー!!

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  16. なんか書きます

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  17. ハッカソンの時の話

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  18. 何価格

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  19. Overwrite

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  20. Linuxコマンドも知らずにセキュリティエンジニアになった話

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  21. Overwrite

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  22. Join calendar on 22 day

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  23. GitHub上の機密情報は消えない〜Webhook URLを公開してしまった末路〜

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  24. PythonではなくJavaScriptを最初に勉強していれば

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  25. アプリケーション開発者でもインフラの知識が必要だよと思った話

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Series 2

SundayMondayTuesdayWednesdayThursdayFridaySaturday
30
後日記載予定

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Overwrite

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Join calendar on 3 day

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Join calendar on 4 day

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About posting period

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When you participate, we will assume that you have agreed to the terms of use

何か書きます

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google cloudについて

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Linuxカーネルを勉強できなかった懺悔について書きたい

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何かかく!

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何か書きます

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なんかかきます。

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何か書きます

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もっとGitを勉強しておけばと思った話

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2627
  1. 後日記載予定

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  5. 何か書きます

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  9. Overwrite

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  11. Join calendar on 11 day

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  13. Overwrite

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  15. google cloudについて

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  16. Join calendar on 16 day

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  17. Join calendar on 17 day

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  18. Linuxカーネルを勉強できなかった懺悔について書きたい

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  19. 何かかく!

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  20. Overwrite

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  21. 何か書きます

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  22. なんかかきます。

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  23. 何か書きます

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  24. もっとGitを勉強しておけばと思った話

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  25. Overwrite

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SundayMondayTuesdayWednesdayThursdayFridaySaturday
30

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書きますー!!

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なんか書きます

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ハッカソンの時の話

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何価格

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Linuxコマンドも知らずにセキュリティエンジニアになった話

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Join calendar on 22 day

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GitHub上の機密情報は消えない〜Webhook URLを公開してしまった末路〜

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PythonではなくJavaScriptを最初に勉強していれば

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アプリケーション開発者でもインフラの知識が必要だよと思った話

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If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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When you participate, we will assume that you have agreed to the terms of use

2627
  1. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  2. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  3. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  4. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  5. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  6. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  7. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  8. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  9. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  10. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  11. Join calendar on 11 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  12. Join calendar on 12 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  13. 書きますー!!

    Overwrite

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    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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    When you participate, we will assume that you have agreed to the terms of use

  14. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  15. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  16. なんか書きます

    Overwrite

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    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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  17. ハッカソンの時の話

    Overwrite

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    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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    When you participate, we will assume that you have agreed to the terms of use

  18. 何価格

    Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  19. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  20. Linuxコマンドも知らずにセキュリティエンジニアになった話

    Overwrite

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    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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    When you participate, we will assume that you have agreed to the terms of use

  21. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  22. Join calendar on 22 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  23. GitHub上の機密情報は消えない〜Webhook URLを公開してしまった末路〜

    Overwrite

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    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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    When you participate, we will assume that you have agreed to the terms of use

  24. PythonではなくJavaScriptを最初に勉強していれば

    Overwrite

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    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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    When you participate, we will assume that you have agreed to the terms of use

  25. アプリケーション開発者でもインフラの知識が必要だよと思った話

    Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

あの時「もっと◯◯を勉強しておけば!」と思った話 by エルピーアイジャパン Advent Calendar 2025 is recruiting participants

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