Human: How do you build a deck? Assistant: 
To build a deck, start by deciding on the size and shape of your deck. You can either go for a rectangular or square shape depending on the amount of space you have available. Next, decide what type of material to use for the deck. Wood is usually the most popular choice as it provides good durability and looks great. After that, measure out the area where you want to build the deck and make sure there are no obstacles in the way. Then, purchase the necessary supplies such as lumber, nails, screws, etc. Finally, begin building the deck following the instructions provided with the materials.