When you have finally decided to start consuming meaningful content and you have focused the topics around a purpose there is one more thing to be aware of: information overload.
Usually used in a context of getting too much information from different sources, but in general it's just too much information.
We are still only humans. Our learning and understanding capacity is limited. Even if we could pore through all the books written about our chosen field in one day we wouldn't be experts in that field. It's probably even less that we could know after such feat than it would be after reading just one page.
Learning is not about consuming information. It's about understanding. It needs time.
It's much like physical training. You can't do it all day every day. And they both also require recovery periods. Rest and relaxation. But you also gain mental stamina, you can go on longer, and speed, you will understand faster. The gray muscle needs workout too.