Explicit tracks beat auto-placement surprises. Use tu-grid-cols-2 for split layouts; span cells with tu-col-span-2 when needed.
Going deeper
In production utility-first CSS work, Columns and rows matters when documents, stylesheets, or apps must stay maintainable across teams and releases—not only in isolated demos.
Common pitfalls
Watch for copy-paste configs, skipping validation or tests, and mixing concerns (structure vs presentation vs behavior) in one layer.
Practice
- Apply one technique from this lesson in the playground.
- Write one interview-style sentence explaining when you would use columns and rows on a real project.