Watch the Phrygian online guitar lesson by Bruce Arnold from Total Modal

With all the modes you learn in Total Modal try to relate them back to modes you have already learned to help you memorize them. For instance Phrygian is like a Dorian mode but you have added a b2 and a b6 to the b3 and b7 found in the Dorian mode.
Phrygian can create some very interesting sounding chord progressions. I have listed a few of these on the mode construction and chord application document.
You always need to apply the modes through improvisation and composition. You will gain a personal connection to these modes by doing this, which is essential.
If you are playing the Phrygian mode over a minor jam track the b2 and b6 are avoid notes and will feel like they need to resolve. Frequently students have a hard time understanding that the characteristic notes of a Phrygian mode are the b2 and b6 yet they are the avoid notes. Nevertheless it is true, and when playing the mode listen for how the b2 and b6 want to resolve. You can also play the Phrygian mode over a 7sus4 chord. When you use a 7sus4 chord the b2 and b6 don't need to resolve because they are available tensions on a 7sus4. Look at the charts of modes grouped by chord type to see what the avoid notes and tensions are for each chord type and mode.