Watch the Holy Grayle online guitar lesson by David Hamburger from Blues Architect

Once you know how to get from triad to triad on more than one chord, the next step is to use those triads to get from one chord to another without changing position - for example, to move from Bb to Eb, or from Bb to Gminor. You'll know you've got it when you can keep one note the same moving from I to IV, or two notes the same moving from I to vi.