Hey there! A good place to start would be the Guitar Fundamentals 2 Course. Some of this you'll already be comfortable with, but it gives a good introduction to the theory behind everything. Feel free to skip over the sections you already know (barre chords, for example).

Once you feel comfortable with the material in Guitar Fundamentals 2, then you should have a nice foundation to start the Blues 1 course. Anders does a great job explaining the theory as you go through that one as well.

Here's a link to the Guitar Fundamentals 2 Course:

https://www.guitartricks.com/course.php?input=fundamentals2

Hope this helps, let me know how it goes!

Mike