It's a really good block to check that your quarter inch seam allowance is right on. Each of the bars should measure exactly 1 inch across when you're finished sewing. If they aren't exactly 1 inch across then you have to do something to make sure that they will be in the future, whether that means pressing it better, or moving your needle position, or stitching just inside the edge of your sewing presser foot. It's a lot more common to Sew a seam allowance that's too wide than too narrow.
Well good luck with your sewing, it's really feeling like autumn today so we are back to quilting season.I am stitching a binding on to a quilt that I hope to take into the shop on Monday so that's pretty exciting for me.