Each piece of furniture is marked by a certain number of crowns. This represents its prestige. The higher the prestige, the more gold that particular piece of furniture will bring in over time. Although the higher prestige items usually cost more, try to purchase them to earn more gold in the end.
Layout
Do not create rooms that are too large. You can increase their size when you are plotting their location, however for each increase in space the room's total price will rise. Plan how much furniture will be placed in the room and size it appropriately. Empty room space is just a waste of your gold.
Trading post
Reach level 3 to get a trading post for your castle. It is used to send merchants to complete trades. You can choose the duration of the trade. The longer the merchant requires to complete the trade, the more gold it will be worth. Longer trades have an initial fee that must be paid before the merchant leaves the trading post. Always keep a trade active. When actively playing, set up shorter trades. Start longer trades before you log out.
Wood
The royal forest features the best trees, which can be located near your castle plot. Tap rapidly on the trees to cut them down. If possible, cut them down as soon as some are ready. You do not have to stop cutting in order to tap the pile of wood to collect it. Leave the wood on the ground and it will automatically be collected after a few seconds. Replant saplings after you are done chipping down trees.