• be patient!
• drink lots of water
• take Omega 3s
  • e.g. salmon, avocado, walnuts, pumpkin seeds, mangoes, eggs, spinach, sweet potatoes
• wash your hair as little as possible; use dry shampoo instead. This helps prevent oily scalp.
• a few hours before washing your hair, apply coconut oil to approx. the bottom third of your hair. Make sure it is:
  • cold-pressed, extra virgin
• or try olive oil, honey, mayonnaise, or an egg mask before washing.
• when washing your hair, only apply shampoo to your roots.
  • try using conditioner only.
  • try using home remedies such as baking soda followed by apple cider vinegar.
• when applying conditioner, apply it to the bottom two-thirds only.
• don't ever brush your hair when wet.
• use a hairbrush with plain bristles, not the ones with little balls on the end.
  • a wide-tooth comb is also good.
• don't ever tease your hair.
• don't use any heat tools: that includes hairdryers!
• braid your hair before going to bed at night.
• use a pillowcase made out of soft fabric such as satin to prevent snags and tangling.
• if you notice any split ends, trim the ends to prevent them from getting worse.
• when going swimming, use a swimming cap or don't let your head go underwater. If you get chlorine on your hair, wash it as soon as possible.

From here. I highly recommend watching the video for a lot more info!