My safari is in dangerous

For all practical purposes your phone can’t be hacked, even if you click on a sketchy link. But you can get bogus warnings from criminals trying to steal your identity or your money (or both). See→Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Don't click on unknown links and delete cookies and history on Safari if in doubt.

rama79 Said:

"My safari is in dangerous: How to protect my phone from hacker"

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Hacked?

What makes you suspect you have been hacked? More information would help. Unless you have a jailbroken phone, then no, it is not hacked.

Start with this: Device and Data Access when Personal Safety is At Risk