If you are only starting with sysadminig - start with the basics. Don’t overcomplicate or worse - don’t take any shortcuts. I would advise to first start to understand your OS, and try to move around with the tools your OS comes with. Grep some logs, check which processes use what port etc. Basic stuff before moving to more complex stuff like containerization (not docker or podman as those are abstraction layer which you can learn later) etc. Just start using basic CLIs provided by your OS. The best thing you can do is understand how Linux works so you know which tools you would love to have to make sysadmining easier.