Watch the Turnarounds online guitar lesson by Joe Dalton from Acoustic Blues Handbook
The turnaround does just that. It turns us around back to the beginning. There are many variations to learn. As we add them, try to note the similarities from one to the next. They are all related. The turnaround is one of those elements of the blues progression that you can mix and match. You can plug these things in as if they were modular. Use your ear and discretion to find the turnaround that is most appealing or tasteful for the given situation.