Totally normal if it takes a while to digest all this stuff. I know it did for me….
The benefit to memorizing the 1/4/5/6m in close proximity to each other is when you’re at a jam and learning a song you’ve never heard before. You have quick access to the most common chords in that key rather than having to jump around all over the neck.
The F, D shape and Barre shape are just different inversions of the same chord. An inversion means we’re just taking the three notes of the chord (in this case G, B and D) and stacking them in different combinations.
These will help you smoothly move around the neck but also is where you’ll find your melody notes for soloing.
Mike