Yep, Nemo is the default file manager for Cinnamon.
I don't know if there's a specific webpage for its shortcuts, but it's a fork of Nautilus (the file manager for gnome), so the shortcuts should be more or less the same.
Though I don't know if there's a specific page for nautilus' shortcuts either.
For starters: http://www.ihaveapc.com/2011/05/list-of ... shortcuts/
I'm afraid you'll have to wait for someone more knowledgeable on the subject (or do some googling on nemo and nautilus).