Making quilts isn't about a single skill or technique. The final outcome depends on how everything about the process meshes together to create the finished project. Sure, you'll encounter more than five elements each time you make a quilt, but there are indeed 5 common errors you don't have to make.
This medallion quilt was written as a mystery -- not one of our 'big event' mysteries, just a pattern I decided to write in that way. But it's complete, and you can practice your mystery skills by taking it one page at a time -- or peek ahead to see the end result before choosing fabrics.