Master the two most important chords (tonic and dominant) and the related arpeggios and scales, all in a musical context.
The 60 second sequence is easy to memorise and will give you the most benefit in the shortest possible time.

This book limits itself to tonic and dominant chords because these are the first sounds to learn on the instrument. They will stand you in good stead no matter whether you decide to play Country and Western, Heavy Metal, Latin, Jazz, Classical ... all these styles rely on the tensions and the resolutions of the tonic and dominant relationship.