Backend Terms for Vibe Coding

I want people to be able to type an easy-to-remember name to open my website.

I bought a domain, so why do I still need to set up DNS? Help me point it to my server.

What's that long string in the address bar? I want every page to have its own permanent address.

When I click a button, what actually happens between the browser and the server?

My browser says the site isn't secure. How do I get that lock icon in the address bar?

People far away say the images load slowly. Can they download them from somewhere closer?

My website needs data from the backend. People keep saying I need an API—what is that?

AI keeps returning data with curly braces inside curly braces. How do I read and write it?

People can submit complete nonsense. How do I stop bad input before it gets saved?

The content people submit disappears after a refresh. We need somewhere to actually save it.

How do I write a query for users who placed an order in the last seven days?

Where does the part users can't see run, and who handles things like login and saving data?

Is there a ready-made framework for building the backend, so I don't have to start from scratch?

When people visit different URLs, how do I send each one to the right code?

How do I verify that someone is who they say they are? I need to add sign-in.

After people sign in, I still need different access levels for admins and regular users.

I know a secret key shouldn't go in the code. Where should I put it?

I finished the site. How do I make it available at a URL that other people can open?

I only have a small feature. Is there a way to run code on demand without buying or managing a server?

There's an error in production. Where can I see what happened on the server?