How do you take care of your scalp at home?

I haven't touched my hair at all since I started losing hair in middle school.
But I don't do anything special... I was curious because it seems like there are a lot of people who do scalp home care.
How should I do scalp home care?
Can I just buy a protein supplement or conditioner and apply it?
I wonder if that would work
As we age, our hair falls out more and becomes thinner... These days, when I wash my hair...
I'm so depressed that I don't think I can just eat eggs and black sesame seeds... I need to make an effort to take care of my scalp at home.