With tutorials, courses and building instructions with gears you could learn how to use Gear Wheels, Warm Gears and Racks. Everything spins. With a few gear wheels you could make it spin faster or harder. Check out the examples of different constructions, robots and attachments that make use of gear wheels.
Larvy is a SPIKE Prime robot that moves like a larva or caterpillar. It uses a Large Motor to contract and expand its body, mimicking the crawling motion.
Using two Medium Motors, it rotates four wheels - tilting them sideways or upright as needed - so it can move forward!
A program for the robot can be found here: Program for Larvy - LEGO SPIKE Prime robot
This is a Camel-like robot. We demonstrate an interesting use of gears to make the Camel walk. Fun and entertaining way to learn how to transform motion.