Simple thinking, not simplistic.
The Chord Scale Theory describes the direct interrelation between chords and scales which do not have independent functions but represent the two sides of one coin functioning in relation to a tonal center.Baarrie Nettles & Richard Graf, The Chord Scale Theory & Jazz Harmony, Pg 10
Play and identify secondary dominants
Learning from the Masters
Practice secondary dominants in all keys. One or two different keys each day. This is not a contest, step by step. Take your time.
Continue practicing the previous lessons