I listed this under Blues just cuz' that is my primary style, but you should be able to apply these lessons to just about any style.
In part one we will learn how to use a couple of double-stops to play just about any chord. Double-stop is a common termed used to describe 2-notes played simultaneously, like a chord.
Here is the first double-stop fingering we will use.
I called it a G5 because it has the root and 5th of a G chord. Since there is no 3rd, it can be used in the place of any major or minor chord. Just move the shape to the appropriate location on the neck. For example, at the 5th fret for A, 8th fret for C etc.
You could also use this for a Dsus4 or D11 sound over any chord with a D maj triad.
Page 2 has an example of using this with some slides in a simple phrase thru a standard ii-V-I turnaround, in this case from A to E.