http://www.all-guitar-chords.com/index.php?ch=F&mm=&v=0
You may find theory about triads (3 note chords) pretty interesting and it will make more sense as to where these chords come from. Just google for "Triad Chord Theory Guitar" for starters. If you understand the theory you can build the shapes yourself.
Go easy though. If you are just beginning (as you mentioned) don't let the stuff fry your brain. :)