I clicked on a link and it said that my iPhone has just been hacked I didn’t see that well because I left the website quickly

There are several of those sites that try to get you to buy or download a scanner to fix a problem that does not exist. There is nothing for you to worry about. For the safest browsing make sure at Settings > Safari, you have Block Pop-ups on and there are no Extensions.

It's just a scam. Ignore it.

For a more thorough explanation please read Phony "tech support" / "ransomware" popups and web pages - Apple Community.

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Having an iPhone means "hacking" is one less thing to worry about.

You can defend yourself from threats ranging from low-effort "phishing" scams all the way through sophisticated cyberattacks by following common sense practices that Apple recommends, here:

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Use the built-in privacy and security protections of iPhone - Apple Support

Block, filter, and report messages on iPhone - Apple Support

Keep your Apple ID secure on iPhone - Apple Support