One word of order: de-li-ca-te-nesse!
Emulsify the shampoo in your hands before applying it to your scalp, focusing on the roots but not rubbing too hard.
If you have time, shampoo your hair a second time to make sure you've removed any residue that can cause dullness and rapid re-greasing.
If you're using a mask, let the wet lengths drain as much as possible before applying the product to prevent it from becoming too diluted.
To dry, don't wring out too hard but press the towel gently and dab the lengths.
Don't use a hair dryer all the time, or if you can't live without one, set it on a cold setting.