hemming a dresshemming a dress
how to sew zippershow to sew zippers
bound buttonsbound buttons
inverted pleatsinverted pleats

A thorough guide for making bound buttonholes.
One of my go-to

A straight and to the point tutorial on inverted pleats.

A walk through of basic hemming techniques.

A nice guide to sewing zippers into dresses.

The Ultimate Guides to Basic Sewing: Step-by-Step Tips