You can't learn just from watching videos and reading. They can help but you must do things you want to learn. If you want to get into linux start to use it. If you want to get into programmming try to programm your programs using online guides. Laungauge is yor to select. If you want into networking - try to configure some servers. Use online free courses there is reason to pay for that. If you want to get into cybersecurity you will do the same but it will take longer and learn linux, windows and networking first.
When you got problems try to find solution in internet or even post here for solution. Have a good day.
And here is course of kali linux.
https://www.udemy.com/course/ethical-hacking-basics-kali-20211/ 
