I am just learning to play #chess and would like to find an app for the iPhone that 1) I can play offline and 2) doesn't require me to sign in or pay a ton of $$ to play.

Does this exist?

I don't have people to play against IRL.

Paper #book recommendations also welcome, possibly preferable. I think it might be fun to set up my board and run through some games, but I have no idea where to look for any guides like that.