File System Router ↔ to define Routing by filepath struct; to map FC src path to route
aka File-based-Routing, File-based-Router
Page
export default FC to display unique UI for next File System Router
Index Route
Next.js routes all index.tsx Page to Leaf dir
Shared Layout
UI to share mutliple Pages via children, to preserve state & not trigger re-render
References
Tree↔ Next.js folder struct to def Hierachy for File System RouterPage↔export defaultFC to display unique UI fornextFile System Routerreact-router+file-system Router↔ similar to nextjs File System Router