When visiting friends farms, tap on the treasure box. If it is locked tap on the outside of the box, NOT THE X!!! Then reload your friends farm and find the treasure box and tap on it. Repeat the above method until it opens. Please note: Sometimes it can take a while to open so just keep trying. Also, the box on your personal farm will not be effected by this method.
When you are fishing with your colored bait, check the size of the circle. If it is normal then remove your finger and try again. Once the circle is small it will either be a fish you don't have yet or it will be a bigger fish. You WILL NOT lose your bait if you lift your finger up. Also try in different spots with the same bait. I hope I have helped!
A really easy way of getting gold on Hay Day. It will require a friend that has a lot of gold. Ask a friend to sell you 10 of any item for 1g. (Building mats work best because you can get more.) After they sell you the items for 1g, sell the items BACK to original player for full price. They will get their items back and you will be that much more gold richer. Rinse and repeat as needed. I hope I have helped!
To get more slots, follow these steps: Look in the newspaper and click on a farm. It doesn't matter which, unless there is a useful product to buy. When you have got there, above the name if the farm, click on the icon above the smiley face. This adds them to your friends list and you automatically follow them. Do this a few times to different people and you will get more slots.