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Hi @Cadkunde.nl. Some transient geometry objects in Inventor can definitely be challenging to get your head around. Attached is an old PDF from a class in Autodesk University some number of years ago, and it is pretty nice at describing some of those types of things. The Vector2d and UnitVector2d are the same in every aspect except 'length'/magnitude. The Vector2d's length can be any length, but the UnitVector's length will always be 1 unit, because the UnitVector2D's only use is for specifying direction, not distance (such as for a coordinate system's axis directions). The point coordinates that you either input, or get back from them can be understood this way... A line is drawn from the origin 0,0 point to those coordinates. That line has a direction and length. That is how to see the 'line' type geometry in your head.
Wesley Crihfield
(Not an Autodesk Employee)