I love my keyboard shortcuts on my Mac. if you’re on an iPad with a bluetooth keyboard, you can hold the command key down for a few seconds and it will pop up a cheat sheet with all the keyboard shortcuts you can use in the current iOS app you’re in.
CheatSheet replicates this on MacOS. If I have a new program that I’m not familiar with, holding down the Command key reminds me. Otherwise, I’d have to flip through the different menus to hunt down a menu command or keyboard shortcut.
The price? Free!