Yes repo is repository and yes Visual Studio Code. You got it 😄
As for the CSS in the backend, yikes, this is scary. I need some standard web dev practices. I hope I do not have to rely on the editor too much. So far I am a little skeptical of SS, but I also disliked Shopify in many ways. But with Shopify the CSS you can see in dev tools, is the CSS you can find in the code base. So finding things to customize was doable, so far with SS I am a bit lost. So far it does not feel like web dev.