CSS Grid is the most powerful layout system in CSS. Unlike Flexbox (one-dimensional — a row or a column), Grid is two-dimensional — it controls both rows and columns at the same time. It's perfect for full-page layouts, dashboard grids, photo galleries, and any design with an explicit two-axis structure. Flexbox and Grid work beautifully together — use Grid for the big picture, Flexbox for the details inside.
1-A 2-A 3-A 4-A | 5 columns 6 columns 7 = display:grid; grid-template-columns:repeat(auto-fit,minmax(200px,1fr)); gap:16px; 8 = grid-template-columns: 250px 1fr; 9 = Grid for page-level 2D layouts; flex for 1D rows/toolbars | 10 = grid-column: 1 / -1 (or span 3)