1. Route Tree - 사용자의 마인드가 되어 웹사이트이 구조를 어떻게 만들지를 구상해야 함 - globalRouter에 login search Router 만들기# Global/ -> Home/join - Join/login -> Login/search -> Search# User/user/:id -> See profile/user/logout -> Log out/user/edit -> Edit my profile/user/delete -> Delete my profile# Videos/videos/:id - > See watch video in my channel/videos/:id/edit -> Edit video/videos/:id/delete -> Delete video/videos/up..