Sewing Techniques and Stitches.
This tutorial on How To Sew A Button is really handy as it shows you the correct way, making it really strong and durable. Follow the link for the tutorial; http://www.artofmanliness.com/2012/06/28/sewing-on-a-button/
If you would like to learn or brush up on other basic sewing skills and techniques go here; Sewing Techniques & Stitches to find the skill you would like to work on.
If you would like to see easy/ beginner sewing projects go here; Easy/Beginner Projects
If you would like to see challenging/Experienced projects sewing go here; Challenging/Experienced Projects