Sewing a button is one of those basic sewing skills that most makers have, but it's not unusual for stitchers to be absolute pros at attaching flat buttons but totally clueless when it comes to other styles.
Sewing Basics: How to Sew a Shank Button
Buttons and Buttonholes on Your Knits - Jill Wolcott Knits
How to sew a button for absolute beginners - Mindful Living Network
How To Sew on a Button Simple Hand Sewing Method - You Make It Simple
Sewing Basics: How to Sew a Shank Button
How to Sew a Button: Apple Tree Sewing Project - Rhythms of Play
How to sew on Buttons
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How to Sew on a Button: All About Sewing on a Button - Threads
Shank Buttons - {michellepatterns.com}
How To Sew A Button By Hand - AppleGreen Cottage