In Section Two you have covered the chords, rhythms and techniques used by most rhythm guitarists. If your ambition is to join a group, now is the time to do so. The only way to become a good rhythm guitarist is to be a rhythm guitarist in a group. The experience of being in a group will improve your playing immensely.
As well as being in a group, you need to listen to and copy other rhythm guitarists. Try to see as many "live" groups as possible.
Here is a summary of what has been covered in Section Two.
CHORDS: Root 6 bar chords: major, minor, dominant 7th, m7th, 6th.
Root 5 bar chords: major, minor, dominant 7th, m7th, 6th.
"Rock" chords.
RHYTHMS: Reggae
Triplet rhythm variation
TECHNIQUES: Percussive strum (L/H deadening technique
R/H deadening technique
Staccato strumming
Arpeggio picking
Dampening technique
THEORY: Key signatures
Major scales: C, G, D, A, E, F, B flat and E flat
Rests in music
Basic patterns: Blues and Turnarounds
Chord constructions: major, minor, dominant 7th, m7th, 6th
Time signatures: simple and compound time
Also read Appendices Four and Five; and revise Section One.