Flexbox provides a high level of flexibility when it comes to creating responsive and adaptive layouts. It offers three key properties: flex-grow, flex-shrink, and flex-basis.

The flex-grow property determines how any remaining space in the flex container is distributed among the flex items. By assigning a positive value to flex-grow, you can specify how much each item should grow relative to the others. For example, if you have three flex items and give each a flex-grow value of 1, they will all grow equally to fill any available space. If one item has a value of 2, it will grow twice as much as the other items.

The flex-shrink property, on the other hand, controls how the flex items shrink when there is not enough space. By default, all flex items have a flex-shrink value of 1. This means they will shrink equally to fit the container if necessary. However, you can adjust the value to give certain items more priority in the shrinking process.

Finally, the flex-basis property determines the initial size of the flex items before the available space is distributed. It can be set to a fixed value, a percentage, or a keyword like 'auto' or 'content'. By default, the flex-basis is set to 'auto', which means the items will take up their natural space.

In combination, these three properties provide a powerful way to create layouts that dynamically respond to different screen sizes, allowing your website to be more accessible and user-friendly.