In Hay Day, the primary resources include crops, animals, and goods. Players grow crops like wheat and corn, raise animals for products like milk and eggs, and then craft goods for sale or trade.

You can expand your farm by purchasing additional land. This typically requires using land expansion materials, which you can find by completing tasks, or trade with friends and other players.

New buildings and features in Hay Day can be unlocked by leveling up. As you gain experience points through various activities, you'll reach new levels that will grant access to additional buildings and upgrades.

If you're out of space on your farm, consider selling or storing some items. You can also expand your farm by using land expansion materials, which allows you to increase your available space for crops and buildings.

To trade with other players in Hay Day, follow these steps: 1. Open the newspaper by tapping on the icon. 2. Scroll through the listings to find items other players are selling. 3. Tap on an item you want to buy. 4. Confirm your purchase by using coins or diamonds.