React, SASS, used useContext hook to pass props

I would like anyone that can explain to me or point me to a resource that can help me fully understand Interfaces in TypeScript. I'm new to React and TypeScript and I tried to pass state as props to one of my child component, but it didn't work because I was unable to define the type of the "setState" function. I eventually had to use type "any" and that defeats the purpose of using TyeScript in the first place. I'd also appreciate comments on my tagNames.