Hm,
Still not sure what you don’t understand exactly, but (and here’s where you wish you’d have paid attention at Math):
every Object (in CG) has its own (Orthogonal) Coordinate System and where the 3 Axes meet is the Object’s Origin…When people mention the Object’s Origin, the accompanying Coordinate System is implied, so, while you can’t Rotate a Point, you can rotate an Object’s Origin (thereby Rotating the Axes of the Object’s Coordinate System).
This probably won’t answer your question, but please contemplate on this and then re-formulate your question.
And please use more words…people are tempted to use less words, if they don’t know a language very well, so as to make less mistakes (I do that as well), but it’s (counterintuitively) better to not fear the mistakes and say more, so others are more likely to make sense of what you are trying to say.
