For a while, I could not understand what a Progression was, I knew, for example that: D, G, C was a 2 5 1 in the key of C but when I saw chords like:
Left Hand / Right Hand
D / F A C E
G / F A B E
C / E G B D
or especially (whcih is the same progressions)
D / FM7
G / FM7b5
C / Em7
Two things happened which really helped me to understand
1. I stopped looking at the chords as a left hand right hand thing and started looking at the chords as a unit.
Before I use to just think:
C E G was a root chord
E G C was the first inversion
G C E was the 2nd inversion
This information is good to know, but was useless to me when I went to play the keyboard.
Finally I realized that (actually I think I read it somewhere):
C / C E G was a root
C / E G C was also root position
C / G C E was also root postition.
This really help me to realize that I have to think of the entire chord and not as a left hand right hand thingy.
2. Secondly, I took the time to start to learn my chords. Once, I started to learn my chords, I really started to understand the progressions. I could see that:
D / FM7 or D / F A C E
was actually a Dm9 (D minor 9) chord
G / FM7b5 or G / F A B E
was actually a G13 chord and
C / Em7 or C / E G B D
was a CM9 (C Major 9) chord.