If you're adding buttons to your project, consider using button loops instead of buttonholes. It's an easy way to keep things closed and can be done using cording.
Button Loop
Tag: cording
Sewing Machine Couching
Want to do decorative sewing with corded trim? This is called couching and it's easy to do on your sewing machine even if you don't have a special presser foot. This demo shows you how.
Elastic 101
Overwhelmed trying to decide which type of elastic to use for your sewing project? This video provides an overview on the most common types of elastic and their best uses.
Drawstring Casing
Create a simple casing, using a seam as an opening, to create an easy way to cinch the top of bags with a drawstring.