If you want to buy a house, you need to find the House Manager, which can be found in almost every town. When you buy a house, your bank slot increases according to the house you buy. There are 5 different houses, these are briefly as follows:
The default home is free. Increases the bank slot by 16. It has 1 room and has 9 seed fields.
Skyland House, Increases the bank slot by 32. It has 2 room and has 36 seed fields.
Antartica House, increases the bank slot by 48. It has 3 room and has 36 seed fields.
Samurai House, increases the bank slot by 48. It has 1 room and has 36 seed fields.
Pirateship House, increases the bank slot by 48. It has 1 room and has 36 seed fields.
If you want to buy furniture inside the house, you need to find House Store Max when you return to your home.
If you want to buy seeds, you have to find Farmer Sophia when you return home. In order to plant seeds at home, the "Edit Mode" button above must be turned on.