How do I repaint builder grade doors

All my interior doors are plain white builder grade. I am currently in the process of painting all the door knobs black, should all the doors be painted the same color throughout the house or different colors based on the room color? I want to update my trim to a brighter white, if I update the trim to a brighter white, and decide to keep my doors white, should the doors match the trim color? What is the best way to paint builder grade doors?

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