How to systematize and structure knowledge?

Question

PHP

Hello, I got the feeling that I know a little bit of everything, if I read the documentation, then I know most of what I read, but I don’t know where and how it can be applied ...
What can be implemented or somehow structured knowledge of my own, in order to have a clear feeling that I understand the topic?
Simply put, what to learn, what to do in order to become a "pro" so to speak.
I would be very grateful for advice .

Answer 1

https://www.google.com.ua/search?q=site%3Atoster.r...