If you opened this right after you downloaded it, you should see in the URL Bar that this is actually a flie that's been loaded into the browser straght from your hard drive. When you use live-server, the url bar will change to your ip on port:8080. When you see that, you will know that you have used live-server correctly!
Once live-server is setup correctly, you should be able to make a change to this file in VSCode ( or which ever editor you're using ) and see that change automatically updateded here when you save!
Great job!