Master of Orion: Conquer the Stars/Colony Management

Do not overbuild
One of the quickest way to hamstring your empire's growth is to over-build structures on the colonies. Example, building pollution control structures on a volcanic planet. You can do so, but all you will do is eat up credits. Advise: build only what is needed and ignore the rest

Hire only the needed leaders
During the game, various leaders will present themselves to be hired. Hiring too many managers will bite you later on when they get their raises.