You can join crochet squares together with yarn and a crochet hook. I will show you how in the video below. There are different methods to join squares, this is only one option. With this method, you will hold your squares with their right sides together, and slip stitch through the stitches along the edge of the squares. This creates a ridge along the back of the squares and allows the joining yarn to show a little on the right side of your finished item. I will share a different joining method in my next blog post, so stay tuned for that!