🎯 What you'll practice: The 8px base unit, valid spacing multiples, and column grids.
1-B 2-B 3-B 4-B | 5 = densities 6 = Material 7 = e.g. 8px, 16px, 32px (any 8-multiples in range) 8 = Because everyone uses the same predefined values instead of picking arbitrary numbers, spacing stays visually consistent everywhere 9 = Column grids define consistent breakpoints and column counts so layouts reflow predictably at different screen widths | 10 = 10/15/22 aren't multiples of 8, so they'd create subtly uneven spacing; corrected values would be 8px, 16px, and 24px.