Learn to make a double crochet decrease, also called a double crochet two together (dc2tog) with this video, written instructions, and photos. There is also a chart and written pattern at the end to make a small swatch to practice your new skill. To learn to make a double crochet, see this post.
In the samples seen in this video and post, I used Lion Brand Vanna’s Choice yarn.
How to P2tog – Purl Two Together Tutorial
Do you know how to p2tog? It’s just exactly what it sounds like, you purl, but instead of picking up 1 stitch, you pick up 2 and then you just purl them as one.