When establishing new cities, consider several factors. Firstly, ensure the location has access to fresh water (rivers or coastlines) for increased Food production. Secondly, prioritize strategic resources that your capital might lack, such as Firaxite for advanced energy technologies or Titanium for powerful military units. Thirdly, consider defensibility; settling on a hill or near chokepoints can make your city easier to protect. Finally, ensure there's enough space for the city to grow and expand its borders without overlapping too much with existing cities. A good rule of thumb is to aim for at least 4-6 tiles between city centers to maximize resource exploitation. build a Colony Ship unit from an existing city to found new settlements.
