Hey, there & welcome to GT!

Originally Posted by: cjclark1068I have been playing "rhythm" guitar on and off now for about 20 years. I define rhythm as first position/capo'd chords. Recently I have been more off than on and want to put an effort towards playing again. In a vague statement, I just want to be able to play. Style doesn't matter.[/quote]
Thanks for the backstory! You will benefit most from working through our courses in the Core Learning System. A lot of the GF material will be too basic for you, but I encourage you to at least watch through it to see if there is anything you might have missed.
[QUOTE=cjclark1068]Is there a "foundation" that should be learned first prior to moving into the styles?

Absolutely! The Fundamentals courses. I'm guessing you could really benefit from starting in GF2.

http://www.guitartricks.com/course.php?input=2

After you start getting the hang of the GF2 beginner scale exercises & understanding how scales relate to chords, then the whole fretboard opens up for you!

Next choose Anders's rock or blues courses. He does a great job of showing how to start making licks, riffs & melodies with very basic easy to understand scale & chord patterns all across the guitar. And he uses those basic chords you already know as a launch pad!

http://www.guitartricks.com/course.php?input=rock1
http://www.guitartricks.com/course.php?input=rock2


http://www.guitartricks.com/course.php?input=blues1
http://www.guitartricks.com/course.php?input=blues2

So many of the ideas in all these courses is applicable to all other styles. But first you have to be comfortable & confident using the whole guitar.

Best of success! Ask more if necessary & have fun!