Every great hairstyle begins with beautiful, healthy hair. The best way to get this hair is to treat it really well. Deep condition every week—you can use mayonnaise, olive oil, or avocado. Just make sure you rinse it out thoroughly and do not use hot water when you rinse it out. Hot water not only would cook the egg in the mayonnaise, but would also dry out your hair.
When you dry your hair, never wring it dry. This can damage your hair's cuticles or even break hairs off entirely, even if you do it with a towel on top of your hair and not with your bare hands. Blot your hair dry, instead. It's the best way to initially remove extra moisture.
If you're straightening your hair, put some thermal styling protectant on it, starting with the roots and making your way back to the ends. Your ends may be the driest part of your hair, but the roots will be exposed to the most heat, so you want that area protected the most. When you dry your hair, you may wish to use a ceramic brush and/or a ceramic ionic hair dryer. This will create negative ions that seal moisture into your hair and keep it silky and smooth.
It's also important to maintain a healthy diet for the sake of your hair. Eat plenty of protein, fruits, and vegetables. Take a multivitamin and make sure you get enough healthy oil in your diet. The most overlooked item here in the States, though, is probably water. Drink half your body weight, but in ounces, in water every day. That way, you can be sure you're getting enough for your particular body at your particular stage of life. So if you weigh 130 pounds, just drink 65 ounces of water in a day and you should stay well hydrated and have better hair as a result.
A treatment for your hair at night to keep it silky is unrefined coconut oil (emphasis on the unrefined part). Just melt a couple of teaspoons in your hands before bed, rub your hands together to get it all over them, and then put it in your hair. It's a good idea to do this for the first time when you have the next morning to be at home, just in case you accidentally apply it too much to just one spot and need to rinse it out, but it's a great, inexpensive trick for keeping your hair silky and lush!