olemus
lühiteatmeleht

Wiktionary:
1. a sheet of paper containing notes used to assist (with or without permission) on a test
If you have trouble remembering all the trigonometric identities, the book has a cheat sheet in back that lists them.
2. (idiomatic) any summary or quick reference used as a shortcut or reminder, such as an aid for public speaking

ülevaateid
https://en.wikipedia.org/wiki/Cheat_sheet

näiteid
https://media.cheatography.com/storage/thumb/cheatography_security-admin.750.jpg

https://media.cheatography.com/storage/thumb/cheatography_security-developer.750.jpg

https://zeltser.com/cheat-sheets/

https://i.pinimg.com/originals/90/d2/64/90d26403328832df18ebd8b5f47f08fa.jpg

https://d1jnx9ba8s6j9r.cloudfront.net/blog/wp-content/uploads/2019/01/JavaString-cheatsheet-Edureka.jpg