If you aren't already a Linux or Mac user, getting around the filesystem can seem pretty alien at first. Truly, if you've only used Windows Explorer, this is going to seem like a strange, alien process. Once you start getting the hang of things, though, you'll find that getting around the Linux filesystem is easy and fun.
The only thing you need to get started is a client connection to your Raspberry Pi Zero. I like to use SSH, but you can certainly connect using the serial connection or a terminal in X Windows.
If you want to find out where you are in the filesystem, use
pwd
:pi@rpz14101:~$ pwd /home/pi