The Ross Walter's course recommends the next step as taking these major scales (C,G,F,D) and learning them as dominant scales. I think it would be wise for me to feel more comfortable with the major scale format before moving forward, so thought it might be fun to simply play all of them against jam tracks. A quick search of YouTube found the following that are fun to improv against:
C Major Scale
G Major scale
https://youtu.be/Z4T2EQnGRGw
F major scale
D Major Scale
Just as an example, I'll post a few seconds of myself playing against a G Major Scale jam track.