To crochet a beanie there are many different crochet patterns that you can learn. The basic idea is to start from the top of the beanie by crocheting multiple stitches into a circular shape. Then the number of stitches is slowly increased each time you crochet around the circle to form the shape of the beanie. Once the crocheted beanie is as wide as you want it, keep crocheting without increasing the width. Continue to crochet in circles around the rim of your beanie until it is the length that you desire.