At a middle stage in learning to sew, you will learn things like how to sew a flat fell seam how to work with linings and you will learn bias basics and bias binding as well. These things are then implemented into your skills so that you can do much more.
At the advanced level, sewing education offers more options about the materials that you can work with. When you are learning to sew at this level, youll learn about sewing with satin products as well as about wool, two much more complex products than what you may be used to.