Route maps are complex and difficult to understand when you are not familiar with them, so in the beginning, it is better to use a map that focuses on important locations (routes) to make it easier to grasp.
Tokyo Station is the terminal station for JR East, JR Tokai, and Tokyo Metro, serving JR East’s conventional and Shinkansen lines, JR Tokai’s Tokaido Shinkansen line, and Tokyo Metro’s Marunouchi line.
新宿 / Shinjyuku
Shinjuku Station is served by ten lines: JR Chuo and Sobu Lines, Keio Line, Odakyu Line, Tokyo Metro Marunouchi Line, Toei Subway Shinjuku Line, and Oedo Line. Located in the center of the Shinjuku subcenter, the station has the highest number of passengers in the world and is recognized in the Guinness World Records.
渋谷 / Shibuya
It is a station of JR East, Keio Electric Railway, Tokyu Electric Railway, and Tokyo Metro.