How Electric Toys Work How Can I Make A Electric Motor Spin In The Oppisite Direction With Just A Switch How Do The Toy Makers Do It?

How can i make a electric motor spin in the oppisite direction with just a switch how do the toy makers do it? - how electric toys work

I'm trying to build a robot arm and can not know how to spend amtu or battery current
theres gotta be a way for as little toy robots that make too