Color work, or Fair Isle, is a technique in which more than one color is worked in the same row. For our Fireflies Hat, that means alternating the color every other stitch, which is a great way to learn this style of knitting without a lot of complications!
The trickiest part of colorwork is getting the tension, or gauge, consistent. The tendency is to pull the yarn tight behind the working stitches, which puckers the fabric and shrinks the gauge, resulting in a tight and rigid fabric. Just let it flow as you knit, relaxing along the way, and it will turn our great!