A few Simple Rules
- that I follow
As Robin said - Keep Notes
Of almost everything, especially any changes you make to anything.
I also, keep a Sticky-Notes list of frequently used CLI and IRC commands.Back-up everything
. Not just the important files you want to 'save' but also, any config files and /.hidden files Read everything
about Linux, the OS-distro and which Desktop Environment and Window Manager you use.
There is a Help/Support Forum to every Linux OS-distro out there. As well as, every particular App/Program you use, has a Help-Forum.
Visit them ... join, ask questions. You don't have to join to read the forums.
In your spare time, if you have the space - create a small partition and put whichever distro you want to play with on it.
And 'play with it' ... tweak it to death. Best way to learn how to fix something - is learn how to break it.
Otherwise ... enjoy your Linux OS-distro.