This screenshot shows an itinerary using the Deutsche Bahn (DB) app. The trip is from Frankfurt Main train station to Colmar on Saturday, April 25, leaving at 11:01.

Notice that just behind the top of the red oval is the statement:  The Tickets can only be used as PDF.  This means you need to present a paper copy to the conductor if asked for your ticket.

By tapping on the screen you can move to the detailed itinerary shown on the next screen

The detail screen shows we take ICE 9590 headed towards Paris East in car 23, seats 101 and 103. The train will make 2 stops before it reaches our destination of Strasbourg where we will transfer to another train that takes us to Colmar.

Clicking on the 2 stops pull down menu takes you to the third screenshot.

This last screenshot shows a bit more detail of the trip.  Specifically it shows the two stops the train make prior to arriving in Strasbourg.

We had tickets on train #9590 headed to Paris East Station. Our tickets got off at Strasbourg.

These two photos describe everything you need to know about our tickets.  They are for an ICE train #9590 to Paris East, leaving on track 5 at 11:01. The tickets indicate that we are seated in car 23, seat numbers 101 and 103. When the train arrives car 23 will line up with area C on the platform. Go stand in area C to wait for the train. Cars 28 and 29 are first class.  Between car 28 and 25 is the food car. 

This is a different train than we have been discussing, however it demonstrates how you identify which train car it is.  This one is Eurostar #9332 headed to Paris North, car 15.

If I had thought to take a picture of the train car we got on in the example we have been using it would have said:  ICE #9590 headed to Paris East, car 23.

Some platforms are intended to allow two trains to occupy one platform at the same time. In this situation the platform is split into virtual sections labeled A and B.  This photo shows platform 15b

This photo shows the overhead storage which is large enough for carry-on sized luggage only.  Larger bags are stored in a rack near the door and sometimes in a rack in the middle of the car.