As a greybeard, I'd suggest how to find and use documentation. man, info, readmes on git, whatever. Not in an rtfm way but it's just quicker and easier a lot of the time.
Another thing would be to figure out what's running or what does a certain thing. apropos helps a little, but it still gets confusing. crond vs systemd timers, for example, or what package manager does my distro run, etc.