I used to know very little about GMOs and I’m currently trying to fill this gap. I somehow assumed that GMOs were bad but didn’t know what they actually are, where you can find them, and so on...
During my research I stumbled upon a book “Seeds of Deception” by Jeffrey Smith: the world's bestselling and #1 rated book on GMO. It provided for a great reading experience and plenty of information on GMOs. I strongly suggest you give it a go!