You can lay one card as Groundwork each turn. This cannot be a duplicate card of it's scenario already that's already placed or completed. This means the contracts that you have fulfilled which are at the bottom of the screen. You will note at the top of the cards there is are dots showing where in the scenario they belong.

The wildcard will give you a choice of resources, but only one resource.

The game is a decision whether to lay the groundwork (set out cards to fill), gather resources (wheelbarrow) or complete the cards (Pagoda). Filling the contracts with resources will move you further along the tracks towards the Gods. Completing a wildcard (multicolour symbol) lets you chooose which track to advance.

When you complete a scenario, you can choose a bonus tile. You can gain an extra space for resources by choosing the circle bonus tile.