@elena follow your heart ️️ i am still learning sysadmin and, like a lot of comments suggest here, I learn by doing! I am mostly experienced in web dev tho.

think of a small project that you would use in your life! start out simple and learn by doing! you will be motivated to make this thing because you will use it!

I also recommend checking out https://pangolin.net/
which is a super cool self-hosting solution that allows you to publicly host local resources on the public net securely!