When I am doing stuff in my city I do everything by bike. For longer trips, for example when I’m visiting my parents I travel by train. Those are pretty much the only ways I travel besides walking.
For me this is everything I need. In my opinion traveling by bike is the nices way to travel relatively short distances. You have no traffic, don’t have to wait for busses or trains and it’s by far the cheapest way to travel.
But trains are also a very nice, at least when they are not completly full. You have enough space, you can work or study. In generell you can just do whatever you want in a comfortable seat.