Gabriel, take the head OFF of your engine. Look at the gasket between the head and the block. Take a picture of it if you can.
While you have it off, look at yhe threads in that hole. If they are destroyed, you can install a threaded insert to repair your block.
Don't panic, but please do answer our questions if you want our help.
If you go off on a tangent, following some YouTuber and blow up your engine, we can't help you anymore.
My name is Dave, and I want to help you.