Changing Root in Nginx

Hi! I’m trying to follow this tutorial to learn Kubernetes. For this, I installed Nginx using Homebrew to run my application. I am having trouble with changing the default root of Nginx, and make it my own application instead (This process is described in the tutorial under the title “Serving static files with Nginx”. I followed what I described there, along with other examples I saw from Google, and none of these seemed to help me.). To re-iterate, what I want to do is to change the default rendering of Nginx to my web application instead, so that when I type “localhost:80” to my browser, I will be able to see my application running, instead of Nginx’ default one. I would appreciate any help/suggestions/resources about this very much!