So if I make my project private, does that mean NO ONE can see any of the code?
On Glitch no one else can see the code.
However, on any web browser is you look at the source you can see the code. However, you can hide some code from both Glitch and “viewing the source”. One example of this is putting a variable in the .env folder.
.env variables can only be used with server side code and not in the client side, so it doesn’t show up in the website’s source.