1. You can absolutely use cast iron on glass stovetops. In fact, cast iron is great on induction because it requires magnetic cookware and not all cookware is magnetic (be sure to heat SLOWLY on induction). Just avoid dragging and obviously dropping the pan on the cook top. 2. The only utensils I don’t recommend are plastic- they’re junk and you run the risk of melting. Metal utensils aren’t going to wreck your seasoning- just don’t launch the corner of your metal spatula into your pan at warp s