With that in mind, I thought I'd whip up a simple hat pattern. You can download it as a pdf in either UK or US terms. The pattern is written specifically for Rico Creative Twist Super Chunky, or Rico Essentials Super Super Chunky and uses just one ball. If you want to substitute a different yarn, make sure it recommends a 10mm hook and that you have 75m of it.
You might find the instructions in the earlier posts from this week useful for help with stitch markers or the magic ring technique.