I'm always looking for a good programming cheatsheet. I've found a few, and thrown out a lot more. But thanks to a comment from Victoria Lo, I was led to this:

Code House is the all-in-one storehouse for developer cheatsheets. Welcoming you to a whole new world of developer cheatsheets. Code House is made up of 300+ curated cheatsheets from 230+ sources. Filter by categories, or source, sort by time or popularity, dark mode, bookmark cheatsheets, add new cheatsheets, request feature, and much more features, make the app amazing!

If you want to read about the project and process first, Savio wrote a great intro and overview here.