Rob Lefebvre, writing for Cult of Mac:
The iPad Pro keyboard has a Command key on it, as do several third-party keyboards.
If you’re already a Mac user (and you should be), you’ll feel right at home when you need to create a new document in Pages, make your text bold or italic, or even show the word count in a document. Here are several key combinations you can use right out of the box.
As far as I know, all of these should work with Bluetooth keyboards as well, regardless of which iPad you’re using. I knew most of these already, but it’s always nice having an occasional reminder to help me learn to actually use them during my writing.