What are “guitar friendly” keys?
Without going too far into music theory here suffice to say that each major key contains six “useful” chords (based on the first six notes of its parent major scale). The eight guitar chords during the early stages feature five of the six “chords that work” in the key of G which makes G a great key for a novice to learn new songs in.
The eight chords also also contain the three most “important” chords in the key of A (A, D and E) which allow a guitar player to work on an infinite number of Blues, Rock and Roll and Country songs during the early stages of guitar playing.
In addition to the important chords from within the key two chords that are useful when playing or composing Rock and Metal songs on guitar in the key of A (C and G) that are not made up only of notes to be found in the A major scale are also found in the eight chords that should be studied first.
To sum it up working in G is great for Pop, Country, Blues and Rock and Roll while the key of A is a great place to start for students who are keen on Rock, Blues or Country styles
When a guitar student has mastered moving between the eight chords in the video they are ready to move onto the next stage which involves introducing new shapes (including Bm (B minor – the final useful chord drawn from the key of G) and the F shape which will allow a guitar player to operate in the key of C.
The F shape should not be introduced too early as it requires a player to hold down two strings with a single finger. You can find out a whole lot more about “how guitar teaching works” if you visit my website https://teachwombat.com