Start here: Homelab series:
I am fond of telling people that if you are serious about IT, you need a homelab.
Also, try to find a local LUG (Linux User Group). If you can’t find one, there are several that meet online. The next step is to attend a Linux Fest, such as the South East Linux Fest coming up in a couple of weeks.
https://southeastlinuxfest.org/
This one might not be near your location, but there are many others. The one I posted above is not your typical IT conference with a bunch of vendors, this one is much more community focused, which is what makes it so special. I learn more at these community conferences than anywhere else, except, you guessed it, my homelab.
If you like to learn from books, then find one of Mark Sobell’s “A practical Guide to” books. I have “A Practical Guide to Linux” and his “A Practice Guide to RedHat Linux” both are very good, but different books. The first one covers commands, editors, and shell programming. But, both serve as reference books for me to look up things. These topics can be found on the internet as well, but often you will find that the book author will provide more of the why to do something in a specific way. Whereas the internet usually just provides the how to do something.
I wish you luck in your journey, and remember, it’s all about the journey, not the destination.