Here are some of the simplest ways to get rid of fleas on a cat:

Use a flea comb to remove fleas and flea droppings from your cat. Use a fine-toothed comb and then, from head to tail, lift the fur with your hands and use the comb to search for fleas and flea droppings bit by bit.
Use a flea collar for your cat. This method is simple and practical; it can both prevent and protect your cat from fleas.
Use deworming medication or deworming liquid. Deworming medication is easier to use; simply apply the liquid to the cat's back. Using it in conjunction with a flea comb will enhance the effect.
Bathing your cat is one of the most effective ways to get results, and there are also flea-repelling shampoos on the market that are simple, practical, and effective.