Learning how to increase and decrease simple crochet stitches is a huge part of growing as a crocheter. While some people rarely use these skills, others will need them for many projects. When you double crochet increase, you will be adding one more stitch to your row or round, and you will decrease by one stitch when you double crochet decrease. If you know how to double crochet already, then these skills should be easy for you to learn and incorporate into your stitching.