Here you can see your favorite routes and stops. You can favorite desired routes and stops from the routes menu.
Clicking on a route name will give you a list of stops that are on the route, along with estimated arrival times if a vehicle is on route.
Arrival times will show you when the next vehicle arrives, and possibly when the next vehicle after that will arrive.
Whenever you see the star icon, you can mark that route (or stop) as a favorite.