How do I fix this dry scalp

[Tal3mn]

What is this dry scalp? How do I fix it? I shampoo around once a week using a volumizing shampoo and conditioner, i also use salt spray and my hair is always itchy like crazy itchy, i can not do anything to my hair at all, maybe it’s itchy because i apply it to the scalp as well?? I use cream sometimes, I try to keep a middle part, my hair used to actually work until I got a buzz and now my hair just stopped working. Any tips on products I have straight hair, and I’m tryna rock a wavy middle part.