root.tsx vs main.tsx

How do I decide what to put in

src/main.tsx

src/main.tsx

src/routes/__root.tsx

src/routes/__root.tsx

?
I am using Zustand, TS Query and Router, and ShadCN. I don't know where I should setup Zustand and TS Query or where I should put my sidebar.

root.tsx vs main.tsx - TanStack