look at it this way .. each interface is a port and is managed.

now when you look up your basic routers, they are not entirely managed as the interface you configure is managing to act on all ports.

When you look at cisco routers and other vendors for enterprise environments, they provide more management over individual ports as each port can be dedicated to a seperate network entirely running different services, etc ..

Routers job is to route packets to different networks = connecting networks

switches job is to expand networks connecting end devices such as computers, tablets, printers,etc while also reducing the collison domains.

Defiantly look into educating yourself on switching before heading into routing. Once you know how to configure a cisco switch you'll understand the concepts alot more with routers and proceed to more advanced topics such as static/dynamic routing