What sites do you know for learning cms?

Question

CMS

Good afternoon. Recently there was a desire to learn new CMS. Now I use mostly Wordpress and if a question arises, I always turn to wp kama first and then to Google.
I want to learn new CMS, bitrix and modx in priority. Interested in the whole PHP backend. What features does it use and how does it work.
It's not difficult for anyone to drop links to popular cms data libraries.

Answer 1

I want to learn new CMS, bitrix and modx in priority. Interested in the whole PHP backend. What features does it use and how does it work.

What's stopping you? Firstly, there is official documentation, and secondly, the code is open, fly into any template and see how the code works. In the most extreme case, there is Google and YouTube, where there is a lot of information.
At one time in the bearded 2012 I tried this with Modx. The flight is normal, there is nothing complicated there.

Answer 2

hardly need
Bitrix
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Answer 3

Try learning October CMS with the Making websites with October CMS screencast series by Watch and Learn.