Function performed by a shortcut in Pages?
As far as I know there is not a canonical list of shortcut keys provided by the program in an easy to find way, however, some third party software has cataloged most Apple apps and some others too.

Give Cheat Sheet a try, I think this will answer your question with this program, as well as a great many others.

In short, after installing it, you hold down command, and it gives you a list of shortcuts relevant to the active app.