Many apps are missing many keyboard shortcuts that you may be used to if you’ve used the equivalent on the desktop. You’ll need to keep the iPad screen accessible to tap on UX elements. There’s also the issue that shortcuts that do exist may be hard to discover because there’s no menu bar to look in.

Hold down the command ⌘ key to view all available shortcuts for the app you’re currently using, and use Fn-m or globe key -m to see a list of all available system shortcuts.