What if your passport expired and your visa still valid and you overstaynow im goin to renew your passportis your visa still valid?

Answer 1

In most countries, especially the USA, even if the passport expires, no problem. You can renew the passport or get a fresh one. The visa must be valid and should not be canceled or mutilated or damaged. Only one passport must be valid. The valid passport and the passport containing the visa - both - should be issued by the same country.

Most countries have the same rule as above.