How do I stop my cat from getting worms

See a vet

If they go outside, you can’t really. Both my cats get a deworming pill every few months.

Stop the cat from going outside and get worm pills every few months

Buy a dewormer. It's a pill like biheldon and you give it by the weight(ask a vet) and you need to do that regularly, every 2,3 months.

Ew this is so gross