Early on, the AI will pay a king's ransom for 1 unit of Horse or Iron. Sell them one by one for flat Gold or Gold Per Turn (GPT).
Once you hit a Classical Golden Age, Monumentality allows you to buy Settlers and Builders with Faith. Because Faith is generally easier to accumulate in large quantities than Gold or Production, you can "spawn" an entire empire in 20 turns. You aren't building a civilization; you're manifesting it. 2. The Diplomacy Gold Mine Sid Meier's CivilizationВ® VI Hack
Never naturally "grow" a forest or rainforest. Use a Builder to "Remove Feature." Early on, the AI will pay a king's