What are some methods for studying textbooks like Euclid's Elements where there aren't a set of problems in each section and a list of answers in the back? I've played around with things like copying a proof directly into a notebook, and I imagine once I have more theorems and postulates and things in my head, I can start trying to prove things on my own and then compare to Euclid's proof. I've worked through several proofs before individually, but since I'm working on doing things in order, I'd appreciate some input so my time is spent more efficiently and I get more out of the process. A broader approach to my question may be: How are classes that focus on logic and proof taught? Specifically, studying of already-proven results.