1Flex Flow
You can combine flex-direction and flex-wrap into a single shorthand: 'flex-flow: row wrap;'.
Learn about Flex Wrap in this comprehensive CSS3 web design tutorial. Learn how to create responsive grids that stack on smaller screens without media queries.
UNLOCK NODES BY LEARNING NEW TAGS.
Responsive Wrapping Logic. Override default shrinkage and command items to gracefully wrap onto new cross-axis lines when viewport real estate is exhausted.
You can combine flex-direction and flex-wrap into a single shorthand: 'flex-flow: row wrap;'.

Pascual Vila
Frontend Instructor // Code Syllabus
The default browser behavior. Forces all flex items onto a single horizontal line, shrinking them aggressively to fit if necessary.
flex-wrap: nowrap;Allows flex items to break out of the single-line constraint and flow naturally onto a new cross-axis line when they exceed the container width.
flex-wrap: wrap;A robust shorthand property that simultaneously configures both flex-direction and flex-wrap in one concise declaration.
flex-flow: row wrap;Controls the spacing and alignment of multiple wrapped lines along the cross axis, only active when flex-wrap is enabled.
align-content: space-between;