A quick tip for keeping your hair strong, shiny, and healthy, is to use a mix of moisture and protein. Too much moisture alone will make the hair soft and flat, while too much protein will cause the hair to get hard and brittle.
I am currently using two different deep conditioners. I rotate between them, one is for moisture and the other is protein also known as keratin. The problem that I face is that I have very long hair, but my scalp is very oily. I don't want to wash my hair every day, but in case I do, I always use deep conditioners (so my ends do look dry and frizzy). I never deep condition my scalp, I apply the deep conditioner starting at shoulder's and working down. If your hair is extremely dry and your scalp doesn't get oily, then you can apply directly to the scalp.
This is just a friendly tip for hair care. Thank you for reading along!