Reddit reviews Tracked Robot Smart Car Platform with Damping Effect System Metal Tank Chassis with Powerful Dual DC 9V Motor for Arduino Raspberry Pi DIY Kit STEM Education, Easy Assembly (11.0x9.8x4.5inch, 3.28lb)
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Damping Effect - Shock absorber spring achieve damping effect. Widely suit for road surfaceAluminum Alloy Car Platform - offer outstanding appearance, higher durability and stabilityDual DC 9V Motor is equipped with a speed feedback circuit and Hall speed. Dual motor offers higher power and speed. NOTE: Battery is not containedFlexibility - go forward, go backward, turn left, turn right, turn aroundEasy to assembled by yourself and easy to learn Arduino Raspberry Pi DIY.
TL/DR: Just get started! All robots need basics coms, motors etc... Learn to control those and you'll find out exactly what you want to build after.
I am in the same boat, decided to build and program a robot from scratch. What the robot should do, I still dont know but I figured I should just get started with the basics; getting a processor communicating with a Motor and some basic sensors
Since I mostly wanted to get experience with hardware/software interface I got a raspberry pi and a robot chassis kit and started there.
Found a really good guide book that shows how to hook up a pi to sensors, motors, etc ... ISBN-13: 978-1119188681
Bought a chassis kit https://www.amazon.com/dp/B077HMY3YK/ref=cm_sw_r_cp_apa_i_Y.N5Ab2GXWV62
I also added a couple of arduinos sensors to play with.