Scalp soothing treatment

Hello.

New one of my hair care journey.

I've seen many types of oils (tea tree, jojoba, Rosemary, Etc) to help soothe scalp itchiness and for general refreshment in between washes

Trying to only wash my hair once or twice a week.

I'm not really trying to do a bunch of work, figuring out dilutions and carrier oils to get the proper mixture to prevent buildup with daily use.

Can someone provide me store-bought products that they buy or simple DIY mixtures that are easy to make it home that don't build up on your scalp?

Thanks