why we use flex in css code example

Example 1: 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

Example 2: css flex

/* Flex */
.anyclass {
	display:flex;
}
/* row is the Default, if you want to change choose */
.anyclass {
	display:flex;
 	flex-direction: row | row-reverse | column | column-reverse;
}

.anyclass {
  /* Alignment along the main axis */
  justify-content: flex-start | flex-end | center | space-between | space-around | space-evenly | start | end | left | right ... + safe | unsafe;
}

Example 3: what does flex do

The flex CSS property sets how a flex item will grow or shrink to fit the space
available in its flex container. It is a shorthand for flex-grow , flex-shrink ,
and flex-basis .

Example 4: css all flex properties

.container {
  align-items: stretch | flex-start | flex-end | center | baseline | first baseline | last baseline | start | end | self-start | self-end + ... safe | unsafe;
}