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Could you please share any ideas or practices on how to do a valid 3 column layout effectively using blocks! All tips and advices are welcome!

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Nice question and good pointer from . Here are concise, practical options and pitfalls to keep in mind when building a block-based 3‑column layout.

Decide your type first: equal three columns, center content with two sidebars, or two narrow sidebars around a fluid center. For modern work prefer Flexbox (easy equal heights, reordering) or Grid (precise two‑dimensional control). If you must support older flows, floats still work: float the sidebars and let the main column sit in the normal flow, then clear the container. Use box-sizing: border-box to avoid width math headaches. For widths you can choose fixed px for sidebars + fluid % for center, or all % for a fully fluid layout. Keep semantic HTML (main, aside, nav) and put main content early in the source for accessibility and SEO; visually reorder with Flexbox/Grid if needed.

Troubleshooting checklist: if columns drop, check that total widths plus padding and margins do not exceed 100% and that box-sizing is applied. If heights differ and you want matching heights, use Flexbox or Grid rather than JS. Use a clearfix or create a new BFC (overflow:auto) to contain floats. Test at different breakpoints and stack columns on small screens with media queries (mobile‑first). If you want, tell me whether you prefer a float, Flexbox, or Grid example and I will post a minimal, tested snippet.

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thanks pritaeas, your example seems to be quite good!

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