In this tutorial, we learn how to build deck stairs. First, you need to level out your work space and then use a tape measure to see how high your stairs will be from the top of the deck to the stairs. After you have these measurements, take your pieces of wood and use a framing square to measure out the pieces of the wood for the steps. After you have done this, you will need to place your piece of wood on the sides to create support, then create indentations inside of them. Place the wood in after this and then create a support underneath and secure all the parts. Once you do this, your stairs will be ready to walk on and safe!