Quick (And stupid) gear motor question
So here is my situation, i plan on building (https://www.instructables.com/id/Beginners-guide-to-building-Arduino-robots-with-Bl/) and i was about to order all the parts and i wondered, why there are so many types of gear motors! my current understanding is the higher "1st" digit (ex 1000:1)means the motor is more accurate and precise and slow. So does that mean one with a low number first (ex 10:1) would be faster? please tell me if i am wrong. So i would like a FAST gear motor for my robot, could anyone post me a link to a good fast gear motor.