My general advice to Linux newbies is just to use your computer as a computer. It's important that you get everything you need working, and over time you'll get more comfortable with how things work in a standard workflow. In ~half a year you might want to explore beyond your workflow and try to make optimizations etc, in which case you'll have a much better idea of what is not working and what you want to improve. On a related note I'd also strongly recommend picking a distro and sticking with it for a while, even if someone says your distro sucks. Don't distrohop endlessly when you don't even know what you want. Linux Mint is an excellent distro that will not hold you back even if you are an expert, so don't mind anyone saying Arch is the king or Debian is where it's at.
I can only speak from experience but from my understanding most people's knowledge of Linux is derived solely from wanting to do something and then figuring out how to do it, instead of studying a list of "things you must know to use Linux".