A progression is simply a group of chords. Each chord in the group leads or "progresses" to the nest chord. You have to understand theory in order to understand progressions. The purpose of a progression is to get back to tonic. Tonic is the 1st chord of whatever key you in. If you in C major, tonic is a C major chord. If you in C minor, tonic is a C minor chord, etc. The way you get there is up to you. Usually, music follows the basic zip code 3-6-2-5-1. You might not play this exactly cuz u can use substitutions and and stuff.
