Summary & Link - 1

W3Schools - Try it yourself
The Flexible Box Layout Module, makes it easier to design flexible responsive layout structure without using float or positioning.

Summary & Link - 2

GitHub
GitHub, a platform for version control and collaboration, employs CSS Flexbox for various layout components. The repository grids, user profiles, and other sections often use Flexbox to create responsive and flexible layouts.

Summary & Link - 3

Medium
Medium, a platform for publishing articles, utilizes CSS Flexbox for its article grids and overall page layout. Flexbox is well-suited for creating adaptive and clean structures, which is essential for presenting articles in a readable and visually appealing format.

Summary

CSS Flexbox, or Flexible Box Layout, is a powerful layout model designed for building responsive and dynamic user interfaces. With Flexbox, elements within a container can be efficiently arranged and aligned, regardless of their size or content. The key concepts include a flex container and its child elements, known as flex items. By applying the display: flex property to the container, it becomes a flex container, and its children become flex items. Flexbox offers properties like justify-content for aligning items along the main axis, align-items for alignment along the cross axis, and flex to control the flexibility and distribution of space among items. Nested flex containers enable the creation of complex layouts. Flexbox is particularly valuable for creating responsive designs, as it allows for easy reordering and scaling of elements, adapting to various screen sizes and orientations. Overall, CSS Flexbox provides a versatile and intuitive way to design layouts, improving the efficiency and flexibility of web page structures.