Welcome to the Revit API!
The concepts are similar.
In Revit, the XYZ class is used to represent both points and vectors:
https://apidocs.co/apps/revit/2019/c2fd995c-95c0-58fb-f5de-f3246cbc5600.htm
It has some geometrical support functions, and you will probably want to add some own extension methods for your personal use as you go along:
https://apidocs.co/apps/revit/2019/b9b10e41-46c7-7e9b-bbd9-b6180e328d4d.htm
Cheers,
Jeremy