Answer 1

"The flex-flow Property
The flex-flow property is a shorthand property for setting both the flex-direction and flex-wrap properties."
https://www.w3schools.com/css/css3_flexbox.asp#flex-flow

"The flex-direction Property
The flex-direction property defines in which direction the container wants to stack the flex items."
https://www.w3schools.com/css/css3_flexbox.asp#flex-direction

"The flex-wrap Property
The flex-wrap property specifies whether the flex items should wrap or not."
https://www.w3schools.com/css/css3_flexbox.asp#flex-wrap