[b]"What exactly do HTTP headers do, and why should I care?"[/b] or [b]"Can someone explain what HTTP headers do i

http headers do everything from security to performance. They’re like the instruction manual for every web request.

`Strict-Transport-Security` forces HTTPS, `ETag` helps with caching, and `Referrer-Policy` controls what info gets shared when you click a link.

If you’re into tools, curl (https://curl.se/) is a CLI way to inspect headers. Just run `curl -I [URL]` to see ’em.