Keyboard shortcuts. If you use them regularly they make getting around on the Mac much quicker. But one of the problems with keyboard shortcuts is committing them to memory. Typically, I try to use/memorize a few shortcuts at a time until they are second nature to me. But sometimes I can’t remember a certain keyboard shortcut. So instead of going through each menu item trying to find the shortcut you could use a handy little (free) app called Cheat Sheet.
Cheat Sheet is simple. When you want to see all the keyboard shortcuts for the app that you are currently using hold down the command key ⌘ for a second. An overlay window will appear and show you all the shortcuts for the app.