Flexbox's power lies in its ability to control the sizing of flex items. These three properties (flex-basis, flex-grow, and flex-shrink) are crucial for creating responsive, adaptive layouts.
flex-basis: Sets the default size of a flex item before space is distributed according to flex-grow and flex-shrink.flex-grow: Dictates how much a flex item will grow relative to other flex items if there is extra space available.flex-shrink: Specifies how much a flex item will shrink relative to other items when there’s not enough space.