2. As a first pass, don't overfocus on the details, focus on the conceptual model: what are the key abstractions, how do they work and how do they interact?
3. Read a book, not just tutorials. Harder for newer frameworks, but got to be something. A decent book will give you a much deeper view than a tutorial, helping you with item 2 on the list.
4. Start looking for common themes that connect to existing knowledge. None of this is really new stuff; front end frameworks inherit ideas from GUI frameworks, and from backend web frameworks. I've written a bit about doing this for programming languages (https://codewithoutrules.com/2016/03/10/compare-contrast/), but same concept applies elsewhere: everything is variations on a theme, basic functional requirements forcing particular forms.