If anything, a good book (or video course) will be a high-density, concentrated pill of everything you need to know about the subject to know what everything is

If anything, a good book (or video course) will be a high-density, concentrated pill of everything you need to know about the subject to know what everything is and how it interacts. By comparison, reading blog posts and random YouTube videos is more akin to "grazing" - sure you can learn, but not as fast and you'll be missing context until the lightbulb goes off.