Chord Progressions info
There are several ways you may see progressions shown. One way is through diagrams. You may also the progression given solely using its intervals, which allows for playing in multiple keys.
Chord Progression Diagrams
The method of using diagrams to show a chord progression is shown first. The first shows a D-G-Bm-A progression. The second shows a G-C-Em-D progression, in two forms (open chords, then as barre chords).