Let's say I want to learn graphic design. (Apologies to InGodsName)

I'd start by googling best graphic design books for lists, then download books that sounded amazing and/or appeared on a lot of lists, from libgen.io. (Other subjects can involve older books from archive.org, or scientific papers from libgen or google scholar) Learn from the best.

Have you ever read the book Thinking as a Science by any chance? The first part of your method is what this book recommends

Let's say i want to learn graphic design.

I start watching YouTube videos about design. Reading random blog post about design just to get familiar with the terminology.

I take part in Reddit discussions on the same topic.

That way i develop familiarity with the subject.

Then i start reading a book and after that i execute the practise.

Anki, it's a flash card space repetition software. You can use it for learning almost everything. Other than that I search the web for study guides on the topic, some open courses and books also.