Summarize this article in one sentence.
Natural hair requires much more moisture than other hair types to keep it healthy. You don't have to spend a ton of money on leave-in conditioners, though: olive oil, coconut oil, shea butter, and cocoa butter are all excellent moisturizers that you can leave in your hair after washing and conditioning. Let your hair air dry and avoid using a hair dryer, as blow drying wet natural hair means the dangerous combination of high heat and lots of pulling with a styling brush. Curling irons, hot rollers, and hair straighteners are also very hard on your hair. There are some things you can do to get your hair straighter, like heavy-duty moisturizing, but avoid heat styling whenever you can to avoid breakage. This may seem counterintuitive because frizz is caused by hair sucking up moisture from the environment, but hair that is already well-hydrated is less likely to frizz. Natural oils like olive oil and coconut oil are excellent frizz-fighters, although there are also many products you can buy that will help defeat frizzing. Products that contain silicone are particularly good at smoothing hair and fighting frizz. They may also cause "crunchy" hair, so experiment and see if you like the results. Sleeping on a smooth satin pillowcase or wrapping hair in a silk scarf before bed is not only a luxurious little bit of pampering, it will help keep your hair from tangling while you sleep.

Summary:
Use leave-in moisturizers. Bypass heat styling whenever possible. Prevent frizz with moisture. Sleep on satin to keep tangles away.