The best way to make a robot is not to start with the most impressive robot. Start with the smallest project that teaches motion, sensing, power and safety without hiding every problem behind a huge mechanical build.
A good robot plan begins with a job: follow a line, move a camera, pick a light object, water a plant, patrol a room or drive underwater on a tether. Once the job is clear, the parts list becomes much easier: controller, motors, driver, battery, sensors, frame and software loop.
Use this page as the hub. Beginner builds teach control loops and wiring. Home builds teach reliability and safety. Advanced builds add harder mechanics like legs, waterproofing or object pickup. Each path below links to a more specific guide with a real parts list and a Builder handoff.