If you mean station types. A quick google search would have given you all you need. https://en.wikipedia.org/wiki/Railw...ation),operational tasks like train overtakes.
Well, there are two grading systems, in effect. One is terminological: A Bahnhof is a facility where trains can stop, start, terminate, change directions and, importantly, has at least one switch (set of points) (not counting passing loops/platform sidings). A Haltpunkt "stop point" is a passenger facility where trains can stop and start but which does not have switches. A further distinction, without a formal definition, is a Hauptbahnhof or main train station, used to indicate the principal station of a city. Bahnhöfe are themselves divided into seven classes or grades based on the traffic volume, service types and amenities available. The 21 Class 1 stations have things like shopping malls, ICE services and very heavy passenger volumes; the Class 2s through 7s are increasingly less ostentatious.