B is a key that is not used too often on the guitar because of the barre chords - and not too many open chords.

A is a very popular guitar key with the 3 main chords A D E - which are easy to play, and all feature the open strings. This gives the key a very full sound on the guitar. There's more songs out there in A than you can shake a stick!

The key of F is not used as often for guitar because it has a lot of barre chords and not a lot of ringing open string ones. It can be a difficult key for beginners uncomfortable with barre chords.

E is a popular key and it uses the lowest E note available on a standard tuned guitar, and is a powerful Rock and Blues key standard.

D is a very popular guitar key with simple-to-add D embellishments such as and D sus2 (used in the outro) and Sus4 (covered later). Contains two barre chords.

There's only one barre chord to play in this one, the B minor, so it's an easy enough one to pick up for beginners. Most of the time you won't hear the m7b5 chord being used in songs as it isn't a very strong sounding chord.

This first part covers the basic chord group from the family "C". These are possibly the easiest chord shapes - as well as the most commonly used.

How to move up to a new key for the chorus and then move back to the original key for the verse.

A practical guide to using diatonic chord knowlege to determine the song's key.