Watch the Blues Turnarounds online guitar lesson by Ton van Bergeijk from Fingerstyle Blues & Boogie Guidebook
Choruses within a tune will always end with a turnaround to the next chorus, with numerous ways that it can be done. The blues turnaround usually comes down to a II - V - I progression, but that doesn't necessarily have to be the case. It can also be used in solo bits or fills and even to move from one chord to another. Plenty of reason to give it some thought!