What type of layout does CSS Flexbox excel at?

The correct answer is that CSS Flexbox excels at single-axis layouts because it is specifically designed to manage the arrangement of items along one dimension at a time, either in a row or a column. This flexibility allows items to be aligned, distributed, and spaced efficiently, resulting in a dynamic layout that can adapt to various screen sizes. Flexbox provides properties that let you control the direction and alignment of child elements, which means you can easily create layouts that respond well to different content sizes or orientations.

In contrast, complex nested grids are better suited to the CSS Grid layout system, which is tailored for two-dimensional layouts with both rows and columns. Fixed grid layouts also rely on CSS Grid due to their need for defining specific grid structures. Responsive images, while essential for modern web design, are not the primary focus of Flexbox, which is more about the spatial arrangement of elements than about handling images specifically. Therefore, the strengths of Flexbox truly shine in creating layouts that smoothly adapt along a single axis.