Deployment problems

Hello, I'm a real beginner at this and I have been trying to deploy my site for weeks now.

Unfortunately, I just cannot seem to get past step 1: _Upload the resulting _site/ (or ../jasper2-pages/) contents to your repository (master branch if uploading as your personal page (e.g. username.github.io) or gh-pages branch if uploading as a project page (as for the demo)._

Furthermore, when I tried using netlify, I'm not sure where the CDN part comes. After successfully deploying (only on netlify), I would get a netlify website with no css from the theme. I'm so lost and confused...

I really love this theme and want to use it for my site. Would appreciate the help!