Where can I find knowledge sources for WordPress?

Question

IT education

Good time everyone!
Having carefully studied our favorite Russian freelance, I came to the conclusion that it is rather difficult to find an order without PHP, then I noticed another interesting fact: many people need WordPress sites.
In this regard, in order not to be like people who go freelancing with zero knowledge, I decided to look for where I can learn the same WordPress. And if with PHP I easily found a book to learn it, then, unfortunately, for WP I found only wp-kama and similar sites. Don't get me wrong, wp-kama is a great site, but there is no structured information. In this regard, a request to the inhabitants of this wonderful portal: could you suggest structured and good (if I may say so) sources for gaining knowledge on this CMS?
PS Thank you in advance!

Answer 1

From my own experience, I can say that you will not find any structured sources. The best way to learn how to do things in WordPress is, ironically, to do things in WordPress.
One of the biggest benefits of using WP for a developer is the huge community and tons of information on the internet. Almost any problem that you may encounter in development can be solved with the help of Google. If not in Google, you stomp into WP chats in Telegram.
If you have no idea at all about the work of WP, then I personally really liked Dmitry Lavrik's course at one time. Firstly, he explains quite well, and secondly, he gives almost all the necessary information there, from which you can then build on to do something more complex (custom post types, custom meta fields, and so on).
Therefore, I recommend doing exactly this: look at Lavrik's course, and then try to make 2-3 projects on WP on your own, googling all the incomprehensible points along the way. Exhaust will be very soon.

Answer 2

https://codex.wordpress.org/WordPress_APIs

Answer 3

could you suggest structured

https://developer.wordpress.org/
https://wp-helphub.com/ (I think it's still a work in progress)
Both of these sites are meant to replace the deprecated https://codex.wordpress.org .