Trim the dead ends monthly and keep it healthy.
Health is... Washing it when needed.
Like if you have frizzy hair wash it every other day.
If you have oily hair wash it everyday.
That kind of thing.
And keep styling products and heating devices out and away from it.
Don't straighten your hair or dye it.
I use Biosilk to keep my hair healthy.
Here's the site
Biosilk - The Luxury and Power of Silk
It works really really good.