WHAT METAL DETECTOR ?

I think books on geology that teach you how to read the land would be way cheaper unless you're beach combing
Searching more for lost treasures but just local fun. Not looking to make money as much as just having fun digging up old rusty things and a few coins and jewelry.
But your right books on geology is what I just started reading learning and finding some interesting things about my area. I have a lot to learn.