learning javascript, but (very basic and minimal) code doesn’t work inside of website. [on hold]

I am driving myself crazy trying to find the answer to this question, because I feel like it has a simple answer and I am just missing it.

A while back I started trying to learn javascript with Gordon Zhu's watchandcode.com program. Through the project, you make an MVC framework that is a "to do list".

Well, I want to apply what I learn to websites, as that is what I ultimately want to do. So I put the code I made from watching his videos into my own website - eliseachavez.com. It didn't work. I scoured my code for typos, and compared it to his--no differences that I could find. Then I just put his code in instead of mine, thinking surely it would work then. Still, it didn't.

Yet, his code works on two different in browser IDE's that I have checked: glitch and codepen.

When I upload the files to my website with cyberduck, I see a basic directory of: [] . So you see, I only have the index.html and script.js files. Is it not working perhaps because it needs more files than that?