Depends what you want to do.
Might be just as useful to look at the example applications included in
the repo or any of the other jack apps.
The source is very well annotated too.
I will definitely be looking at the example applications. I want to eventually understand how DAW applications like Ardour and Qtractor in particular are written, but the source code of those apps are quite intimidating to me at the moment. If there is anything else I can do to aid in my learning, that would be great.
-Kris