Tips on a Cactus? I recently bought a cactus at the store, but i dont...

I recently bought a cactus at the store, but i dont know anything in the region of keeping it alive. can somebody give me tips on how to hold on to it healthy (and alive)?

ex, how commonly is it watered, and how much?
Answers:    you only hold to water them truly once a month. If it's a big cactus plant, or big enough to shake for a while bit, then that help. you can shake it and if you hear water next that means that here is no need to marine it. the great things about cacti is that you don't own to take that much protection of it. eventually when it gets big ample you can even take a piece past its sell-by date of it and plant it into some dirt and grow another cactus plant.
That is a tough question because believe it or not, not adjectives cactus are the same surrounded by their requirements. Some love a sunny windowsill, others can go weeks lacking it. Do you have a sticker on the cactus that tells you the multiplicity? If so, do some research on that particular one. It will minister to immensely.