Combat robotics is engineering with the stakes turned up. You design and build a machine to survive, and dish out, real damage, then drive it against someone else's in an arena. It's a brilliant crash course in motors, batteries, radio control, and structural design, and the community around antweight and beetleweight classes is welcoming and cheap to enter.

The honest part is that it's iterative and a little brutal.

Your robot will get wrecked, and the hobby is as much about repairing and improving between fights as the fights themselves.