When establishing PYTHONPATH, which terminal window to use? Just the regular terminal window (.bash) that opens when I click on Terminal in Utilities in Applications?

Also, as I add the following line to the end: export PYTHONPATH=”/Users/my_user/code”, do I add it to this line, which is already there for some reason? : my-MacBook-Air:~ myname$

Also, how do I save this file in Mac?

And finally, what do i substitute this by?: /Users/my_user/code. Is this the path where I installed Python? So, for example, /Macintosh HD/Applications/ ?.

UPDATE: I WAS ABLE TO FIGURE THIS OUT!!!!!!!!!

I guess it would be super helpful if someone could please type an example of the file that needs to be saved. You can use pseudonames in the path like I did above ('myname'). Thanks so much. I'm very new to this.