As a self taught developer I went through the same pains you’re going through :) I ended up writing a bunch of tutorials myself. Keep at it, eventually things will become second nature to you.

Now, your path has been set to include the files within google_appengine. I don’t really know what the fuck that means, but now you’re set up and can start deploying applications.

$PATH is a variable which tells the system where to look for when you run a program. e.g. typing which git shows that git is actually at /usr/local/bin/git but you run git add from any directory because /usr/local/bin is in your $PATH. Run echo $PATH to see what else is inside.