Because “Git” is the technology. GitHub is just one site that works with it.

Pastebin

https://www.freecodecamp.org/learn/back-end-development-and-apis/

This is probably more up to date than that blog post.

When I was learning I used Heroku free tier to host sites/servers. I was also using the MERN stack and used a Heroku CLI tool to do deployments.

Here’s a step by step guide on freecodecamp.org for how to deploy an app to heroku. Hope it’s helpful!