Honestly you learn most by doing it yourself. Where to start depends on how versed you are with system administration, Linux, self hosting, etc. If you are an absolute beginner then start with Linux sysadmin videos (for example, what are the top most important things to do to a new Linux server, how to secure a Linux servers, etc). Once you have a list of “you should do x” then dive deeper into each topic to make sure you understand why and how.

Just don’t run random commands that you don’t understand what it does. You said you were learning right? Then take that command and learn why and what you are running.

I can help further if you have specific topics you need help with. This community is also amazing but some times a search on the community yields exactly or close to what you are looking for so leverage that too!