Flexbox is a new model for creating layout in CSS.
A Complete Guide to Flexbox
Chris Coyier’s guide to flexbox is, among other things, a reminder to why CSS-Tricks is one of the premiere resources on front-end development. It contains an overview of the properties, including code snippets and easy to read visual representations.
11 things I learned reading the flexbox spec
After learning the basics of Flexbox, David Gilbertson’s covers some interesting tidbits about the flexbox specifications that might not be initially obvious.
As the above article shows, a lot can be learned from jumping in and reading the technical specifications for a new technology. If you find reading technical specifications intimitading, J. David Eisenberg wrote an article on How to Read W3C Specs.
What The Flexbox?!
A simple, free 20 video course that will help you master CSS Flexbox!