[alexduros]

A good sum up to play with flexbox here : https://css-tricks.com/snippets/css/a-guide-to-flexbox/

[cloverich]

Thats been my goto reference for most of my layout needs. I've also found https://philipwalton.github.io/solved-by-flexbox/ useful. Props to all the great authors (including OP) for these -- flexbox + great tutorials has greatly improved my web dev experience.

[exodust]

And don't forget http://flexboxin5.com/

(tip: visit with a computer not a phone)