Loading Screen Hints

I'm going to start adding hints to the loading screen, and I'd love to hear any ideas you guys might have for good hints for new players on how to play, UI tips, advanced strategy, etc.

For example:

• Better to have two of same building than one of each
• Volcanic terrain tends to have more iron
• Secondary buildings should be connected to you HQ
• Watch for fuel costs, sometimes a low, close resource is better than a distant high one