A 'cheatsheet' is a quick reference resource often containing the most common or basic snippets of information needed to get something working.
MakeCode blocks gallery
The MakeCode reference contains a blocks gallery that lists all the blocks available.
Python
A web search brings up a range of cheatsheets for MicroPython. Here are a couple of examples:
https://cheatography.com/aleciko/cheat-sheets/micro-bit/
https://aca.edu.au/resources/microbit-cheatsheet-poster/
If you know of any others, please let us know by providing feedback on this article