Fix crochet mistakes

Crochet usually curls because of tight tension, a foundation chain tighter than the stitches, or a hook too small for the yarn. Flat circles cup when they have too few increases and ruffle with too many. Chain with a larger hook, count each round, and block to smooth a mild curl.

Uneven crochet edges come from gaining or losing stitches at the ends of rows. Missing the last stitch makes rows narrower, and working into a turning chain that does not count makes them wider. Count each row, put markers in the first and last stitch, and frog back to the last correct row.