/ic/ - Artwork/Critique

So, I used to draw all the time, starting from the age of 7 or so up through graduating HS. It used to be so effortless and I would just fill up sketchbooks without even trying. The only issue is, I never learned my fundamentals properly (I blame my shitty HS art teacher I was stuck with three years in a row).

A few years have gone by since then and I've only recently tried getting back to drawing, and damn am I rusty. Now I'm trying to reteach myself the fundamentals I never properly learned.

I just bought a book on anatomy to help me understand all the structures of the human body, but don't know how to go about absorbing what's in the book and applying it to my drawings. I've seen people on here say to just draw every picture and diagram in the book and study it while doing it, but I'm a little confused.

Should I just draw what I see and copy from the book, or attempt to build the forms out of gesture lines and simple shapes? Or both?

Pic related, it's the anatomy book I got

Just got pic related as my first anatomy book. Anyone read through it? It's definitely full of diagrams and breaks the body down into different groups.

So as someone with just a basic knowledge of anatomy I should copy every diagram in here and then redraw from memory?