The flex-direction property determines the direction in which flex items are laid out within the flex container. It can be set to row, column, row-reverse, or column-reverse.

The flex-wrap property controls whether flex items should wrap to the next line or remain on the same line when they reach the end of the flex container. It can be set to nowrap, wrap, or wrap-reverse.

The justify-content property distributes space between flex items along the main axis of the flex container. It can be set to flex-start, flex-end, center, space-between, or space-around.

The align-items property distributes space between flex items along the cross axis of the flex container. It can be set to flex-start, flex-end, center, baseline, or stretch.

The flex-basis property specifies the initial size of flex items in a flex container. It can be set to a specific length value, a percentage, or auto.

The flex-grow property controls how flex items grow when there is extra space in the flex container. It can be set to a number, a percentage, or 0.

The flex-shrink property controls how flex items shrink when there is not enough space in the flex container. It can be set to a number, a percentage, or 0.

The flex property is a shorthand for the flex-grow, flex-shrink, and flex-basis properties. It can be set to a single value or a combination of values.

The default value of the flex-direction property is row, which means that flex items are laid out horizontally.

The default value of the flex-wrap property is nowrap, which means that flex items will not wrap to the next line when they reach the end of the flex container.

The default value of the justify-content property is flex-start, which means that flex items are aligned at the start of the flex container.

The default value of the align-items property is stretch, which means that flex items are stretched to fill the entire height of the flex container.

The default value of the flex-grow property is 0, which means that flex items will not grow when there is extra space in the flex container.

The default value of the flex-shrink property is 1, which means that flex items will shrink proportionally when there is not enough space in the flex container.

The default value of the flex-basis property is auto, which means that flex items will have their natural size.