Should I use Grid or Flexbox?

Use both in tandem. CSS Grid is engineered for the 2D macro-layout of the entire page (like positioning a header, sidebar, and main content), whereas Flexbox is optimized for 1D micro-layouts (like aligning icons inside a navigation bar).

Do I have to define both rows and columns?

No, you do not have to define both. You can explicitly define columns using `grid-template-columns` and allow the browser's implicit grid engine to automatically generate rows as new content is added to the DOM.

What exactly is the `fr` unit?

The `fr` (fractional) unit mathematically calculates the remaining free space in a grid container after all fixed-width elements are rendered, and distributes that space proportionally. This natively replaces complex CSS `calc()` operations.

Should I use Grid or Flexbox?

Use both in tandem. CSS Grid is engineered for the 2D macro-layout of the entire page (like positioning a header, sidebar, and main content), whereas Flexbox is optimized for 1D micro-layouts (like aligning icons inside a navigation bar).

Do I have to define both rows and columns?

No, you do not have to define both. You can explicitly define columns using `grid-template-columns` and allow the browser's implicit grid engine to automatically generate rows as new content is added to the DOM.

What exactly is the `fr` unit?

The `fr` (fractional) unit mathematically calculates the remaining free space in a grid container after all fixed-width elements are rendered, and distributes that space proportionally. This natively replaces complex CSS `calc()` operations.

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CSS Grid Intro | CSS3 Tutorial

Learn the foundation of the most powerful 2-dimensional layout system in CSS (W3C Standard), ideal for architecting complex frontend interfaces.

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CSS Grid is a paradigm shift. It allows developers to author complex, predictable 2D layouts using native CSS, eliminating the need for rigid frameworks or excessive HTML nesting.