CSS Grid is a two-dimensional layout system designed for both rows and columns simultaneously. It excels at creating complex page layouts where you need precise control over both axes. Flexbox is a one-dimensional layout system optimized for distributing space along a single axis (either row or column). Flexbox shines in component-level layouts like navigation bars, button groups, and centering content. Think of Grid as the blueprint of a building (walls define rooms in 2D) and Flexbox as arranging furniture along a single wall (1D flow).

Use Grid when: you need a structured multi-row, multi-column layout (card galleries, dashboards, page skeletons), when items must align perfectly across rows and columns, or when the layout is defined by the container rather than the content. Use Flexbox when: you're arranging items in a single direction (nav bars, toolbars, list items), when content size determines the layout, or when you need flexible space distribution among siblings. Many modern layouts combine both: Grid for the page structure and Flexbox for components within grid cells.

Absolutely! In fact, this is a best practice in modern CSS. Use Grid for the overall page layout (header, sidebar, main content, footer areas) and Flexbox for aligning and distributing items within those areas. For example, a Grid-defined page section can contain a Flexbox navigation bar, and a Grid card gallery can have Flexbox-styled card content. They complement each other perfectly and using both is a sign of a well-structured stylesheet.

Both have excellent browser support across all modern browsers (Chrome, Firefox, Safari, Edge). Flexbox was introduced earlier (2013) and has slightly broader legacy support. CSS Grid landed in 2017 and now enjoys 97%+ global browser coverage. For production websites targeting modern audiences, you can confidently use both. If you need to support very old browsers like IE11, Flexbox has better fallback options, but Grid can also be polyfilled or gracefully degraded.

Flexbox centering: display: flex; justify-content: center; align-items: center; — works perfectly for centering content inside a container. Grid centering: display: grid; place-items: center; — the shortest possible CSS for centering! Both achieve the same visual result for single elements. Grid's place-items is a shorthand that sets both justify-items and align-items to center. For centering multiple items, Flexbox distributes them along one axis while Grid places each in its cell. Try the "Centered" preset above to see both in action.

CSS Grid has some powerful responsive features that Flexbox lacks, such as repeat(auto-fit, minmax(250px, 1fr)) which automatically adjusts columns based on available space without media queries. Flexbox with flex-wrap: wrap can also create responsive layouts but items may not align across rows. Grid's auto-fit and auto-fill keywords enable truly fluid responsive grids. That said, Flexbox is simpler for responsive single-axis layouts. Many developers use Grid for the macro layout and Flexbox for micro-responsive components.

Flexbox is generally considered easier to learn because it operates on a single axis with fewer properties to memorize. The mental model is simpler: items flow in one direction with wrapping. Grid introduces more concepts (explicit vs implicit grids, tracks, areas, line-based placement) and has a steeper learning curve initially. However, once mastered, Grid often produces shorter, more intuitive code for complex layouts. Many developers recommend learning Flexbox first, then adding Grid to your toolkit for 2D layouts.