Useful bass guitar technique video https://youtu.be/-6aInpsT-D0
On this guitar resource page you will find some videos of some of the chords you are learning plus a few scales and bits and pieces.
A major chord A minor chord
D CHORDS D D minor E
A Major Scale 1 Octave
A Major Scale 2 Octaves G Major Scale 1 Octave G Major Scale 2 Octaves G Major Scale 2 Octaves descending
King of the Swingers