Issue setting up dev rig

Ah ok got it. I’ve just finished web dev bootcamp recently so i’m still a bit fuzzy on terminology.

So i can make a node website with an express back end no problem. And render websites and do all that, but i don’t know how to do the same thing with a twitch extension. Do you render the pages the same way? When making the express apps on node js, i used to start a locally hosted server to run the back end, with which i rendered front end ejs files in google chrome. On the dev rig, it asks for a front-end host command. I think i’m lacking some fundamental understanding.