This video demonstrates the Invisible Zipper Foot.
This specialty foot enables you to sew an invisible zipper with precision.
Sewing With Cinnamon video series. Knit Fabrics - Walking Foot Overview
See the installation and demonstration of a few types of stitches and seams.
This video compares a few different hook and loop closures, snaps, hook and eye closures, snaps and how they are used. Also demonstrated is sewing buttonholes with an automatic buttonhole foot attachment on your sewing machine and cutting open the buttonhole.