How do I make something where people can add something and it stays on the page even after they leave?

Question

I have an idea for something and it would work better if I could do that. Also, would there be a way to remove something?

Answer 1

Ok, how would I put that in with HTML or JS?

Answer 2

Look up firebase or heroku. They both have cloud database connections. I know that firebase has a free option as well. But, you will definitely want to authenticate users before you allow anyone to make a connection to your database with write access.

Answer 3

For that you need an database to store that changes.