Drupal 8 Entity API Cheat sheet
Link: https://www.metaltoad.com/blog/drupal-8-entity-api-cheat-sheet
Drupal Twig Cheat sheet
Link: https://git.drupalcode.org/project/twig_tweak/-/blob/3.x/docs/cheat-sheet.md?plain=0
Drupal 8 Form API reference
Link: https://drupalize.me/tutorial/form-element-reference?p=2766
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Source
https://cheatography.com/programming/
https://www.drupaleasy.com/blogs/ultimike/2022/08/are-cheatsheets-still-thing-drupal-developers