Where and how can I test my knowledge of the LAMP stack?

Question

LAMP

It so happened that I did not advance in my knowledge further than the LAMP stack. I tried to study a variety of technologies, but the market decided for me - where there are the most vacancies, I work there.
I no longer want to twitch and jump. There is a desire to become an expert in what I understand at the moment.
Accordingly, I want to close my weaknesses as a specialist. And in order to learn more about them, I want to pass more tests for knowledge of technologies, incl. on a paid basis. Of course, purely for themselves, they did not give up to employers.
Advise please resources on the topic. Directions: PHP, MySQL, native JS, JQuery, HTML/CSS, Linux systems, etc.

Answer 1

php.feedme.com