How to monetize knowledge?

Question

Career in IT

Hello dear community.
Introductory. I studied at a school with a bias in physics and mathematics, then, albeit a mediocre one, but a university with a degree in PMI. As a result, I have a good mat apparatus and familiarization with a number of PLs (performing training tasks of various levels of complexity, I saw the codewars resource in the topics on the toaster, I myself have experience on acm.timus).
About 10 years have passed. Life has taken me in the other direction, now I want to do what I like. The realities of life are such that sometimes you want to eat, which means it should not be just a hobby.
Actually questions. What is being monetized now, to you as current employees of the industry? Accordingly, what should one undertake to learn PL + development environment + database + subd, etc.? What material would you recommend (preferably books, I am suspicious of video materials)? Where and how to get real development experience in the future?
Advice, wishes, instructions, etc. are welcome.
There is time and desire. Give me a vector.
Thanks to all!

Answer 1

Open a job site or freelancing and see "what is monetized". Choose a topic/direction, look for "what to learn to start" in the same toaster.

Answer 2

you go to a site to search for employees, offer a job, etc. "thousands of them"
You look at the requirements for workers in the sector of interest.
You try to fulfill them, or at least understand what the employer needs.
you get to work.

Answer 3

Drkzia, thanks to everyone who replied and commented!
I specify what I want. I myself am surprised by people who say that there is no work, when you show them a vacancy, it begins, "Well, I've been studying for this all my life and I won't go there." I will go as a janitor if the salary there is more than my current one and there are prospects.
I don't want to waste my time learning a dead language. When I was at school in the early 2000s, they said Java is becoming obsolete, and in the tenth, it and its derivatives got a second life, if you look at the cut of vacancies on Habré, the Java script is in 1st place. Recently I read about an article about promising languages ​​​​in it they talked well about Ruby, there was a question on Ruby on the toaster, most of the answers are that there are no new relevant projects on it now, all the existing demand is support for old ones.
As I said, I myself have no preference in PL, but I don’t want to waste time. As I wrote, I solve problems on one of the resources in different languages, that is, I understand the basics of algorithmization, and the specific syntax is acquired. I want to focus on a specific language, so that each time I don’t google the syntax of the simplest operands, and in order to study advanced.
I want to understand at what stage it is possible to enter it in a resume or go freelance - there is no such understanding from the word at all.

Answer 4

judging by hh, knowledge of 1c is most in demand