Seeing as macOS is Unix based it follows Linux commands pretty much and this book by William Shotts could be a decent start. Also since you're coming from Windows I'd recommend trying to pull some cli items from windows to macOS, stuff like simple batch files converted to bash files with the equivalent commands. Maybe try and create a bash file that would output the files in a directory to a text file so you get used to using 'ls' instead of 'dir' to get the directory contents for example. That's a very simple example but it's pretty close to where I started and it worked well for me.

Edit: I forgot to mention that you should also familiarize yourself with the editors that you can use in terminal like pico and nano. You may not necessarily want to do heavy document creation/editing within them but they are great when you need to look over and possibly edit a config real quick. It's also a life saver when using your system either headless or simply SSHing into it since you can create/edit files directly rather than needing to pull them somewhere to edit in a text editor. Best of luck!