Tips sevenwonders

If you are a beginner, focus on acquiring a variety of resource cards (brown and silver cards). This strategy will not require you to analyze your opponents' boards or strategies as much.

If you go the economic route by focusing on yellow cards, pay attention to the people next to you. Some wonders (Alexandria, Olympia B) can do very well with very few resources, so trading posts to those wonders will be almost useless. Some wonders (Giza, Rhodes) do especially well with many resource cards, so trading posts to them will typically be very useful.

Watch out for people who build many green cards. Green cards are high risk, high reward. They have to complete sets of three different symbols. Look at their boards to see which symbol they need to complete their next set, then take those cards yourself, before they can acquire them. If building the green card won't help you, then use it to build your wonder or get three coins instead.

Don't build too many red cards. Whether you beat your opponents 10 to 1 or 2 to 1, your point rewards are the same. The turns you spend beefing up your already-powerful army may be better spent on other cards.