If you get bitten or scratched by a cat, clean the wound with soap and water and then alcohol (or some other disinfectant) and apply a bandage. If you see swelling, or signs of infection, go see a doctor.
Be careful what types of plants you keep in the house. Certain types of ornamental flowers can be extremely toxic to pets (e.g., Poinsettias).
Keep your kitty indoors; outdoor cats have a much shorter lifespan than indoor cats due to injuries, disease, dog attacks, and other dangers.
For a fun treat, buy some catnip and pour a tiny pile onto a tile or hard floor (don't use on carpet unless you plan to vacuum!) Cats love catnip! They will frequently roll around in it, or eat it. Warning: cats sometimes get very active after exposure to catnip. It's harmless and a lot of fun.
Ask your local vet to insert a tracking chip in your cat. This will make it easier to find your cat and track it down in case it gets lost.
If you are planning on getting a cat, make sure to have pet insurance in case something happens to your kitty. You could be saving thousands!
Milk can upset a cat's stomach; water is the best fluid to give to your cat.
Try giving filtered water to your cat, not tap water if your cat is a picky drinker.
Cats have claws and if they are excited, scared, angry, etc., they will use them. So beware, the cat will scratch you. Most scratches are accidental. If your cat scratches you during playtime just say: "NO" and stop playing with him/her. The cat will eventually learn to control their claws while playing.
Give your cat the chance to roam free all around the house untouched if it really wants you to pet it. It will come to you by itself.