I've been wearing a relaxer for a long time now, but most of this I learned only after discovering LHCF (thanks, ladies). My hair has thrived as a result. Most of this has already been stated, but:
1. Moisture, moisture, moisture is our friend (reg. DC'ing and daily moisturizing)
2. Keep hair & scalp clean (shampoo minimum 1x per week; I do 2- 3x per week)
3. No or very little heat (airdrying w/ scarf method is my friend at 7 weeks & beyond)
4. Space time between relaxers (different times work for diff. people)
5. Protein when needed or light protein regularly (again, different heads may need more or less amounts of protein) and always follow up w/ moisture
6. Keep hair off cotton clothes, pillowcases, etc., & the occasional trim is necessary to keep those ends healthy
7. Drink water, work out, take a vitamin (take care of your body & your hair will reap benefits as well)
These seven are pretty simple and should promote healthy, growing, relaxed hair. There is no need to go out and buy 50-11 products & growth aids or have a complicated 14 step routine (trust me; speaking from experience on this one LOL)