CSS Flexbox is a one-dimensional layout system for arranging items in rows or columns. Here's a complete guide.
Basic Flexbox
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Flex Direction
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Flex Wrap
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Justify Content (Main Axis)
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Align Items (Cross Axis)
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Align Content (Multiple Lines)
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Gap
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Flex Item Properties
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Align Self
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Order
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Centering
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Navigation Bar
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Card Layout
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Holy Grail Layout
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Equal Height Columns
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Responsive Flexbox
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Sticky Footer
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Media Object
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Form Layout
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Mastering Margin Auto
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Best Practices
Container:
✓ Use gap for spacing
✓ Set flex-wrap for responsive
✓ Use min-height not height
✓ Consider overflow
Items:
✓ Use flex shorthand
✓ Set flex-shrink: 0 for fixed
✓ Use margin-top: auto for push
✓ Avoid fixed widths
Responsive:
✓ Mobile-first approach
✓ Use flex-basis with calc
✓ Change direction at breakpoints
✓ Test at various widths
Avoid:
✗ Nesting too deeply
✗ Using for 2D layouts (use Grid)
✗ Forgetting flex-shrink
✗ Fixed heights that overflow
Conclusion
Flexbox excels at one-dimensional layouts - rows or columns. Use justify-content for main axis alignment, align-items for cross axis, and gap for spacing. The flex shorthand controls how items grow and shrink. Combine with CSS Grid for complete layout control. For two-dimensional layouts, Grid is often more appropriate.