If you need help understanding the main axis versus the cross axis in terms of flex direction, hopefully this helps. Enjoy.
My name is Estelle Weyl. I an open web evangelist and community engineer. I'm a consulting web developer, writing technical books with O'Reilly, running frontend workshops, and speaking about web development, performance, and other fun stuff all over the world. If you have any recommendations on topics for me to hit, please let me know via @estellevw. View all posts by Estelle Weyl