From StrategyWiki, the free strategy guide and walkthrough wiki

[edit] Main Buttons

The core of the game is in the three major buttons

• Homes: Where your Sims live .
• Workplaces: Where your Sims make money.
• Venues: Where your Sims go to blow off steam.

The concept is this: You build more homes when you want more people. You build more workplaces when you want more money and you build venues when you want your people to be happy.