Answers for "how to work with flexbox"

css flexbox syntax

Display: flex 
Flex-direction: row | row-reverse | column | column-reverse
align-self: flex-start | flex-end | center | baseline | stretch
justify-content: start |  center | space-between | space-around | space-evenly

display in flexbox

/*This defines a flex container; inline or block depending on the 
given value. It enables a flex context for all its direct children.*/

.container {
  display: flex; /* or inline-flex */
}

/*Note that CSS columns have no effect on flex container*/