Working through Rudin , is it normal to forget theorems?

I’m currently finishing Chapter 2 of Principles of mathematical analysis by Rudin, and I’m starting to feel overwhelmed by the number of theorems. It feels like there’s a constant flood of theorems, lemmas, and corollaries, and I often find that I forget them not long after studying them.

Is this normal when working through a book like Rudin? Or is it a sign that I’m not understanding the material deeply enough?

Do you have any advice for how to retain or organize all these results more effectively while studying analysis?

Thanks!