On iphone 8, how can I make my own ringtone?

When I had an iphone 4, I could record a song or sound with the mic and set is as a ringtone, but I don't know how to do that on my new phone.

Put it in vibrate and then when s call comes in, make that sound with your mouth?

Settings.

Well, I found out by myself. You have to use Garage Band app. Why you dix answer stupidly? ㅗㅗ