Tableau Public gives you the full Tableau Desktop feature set — calculated fields, LOD expressions, blended data — at zero cost. The one condition: every workbook you save is published publicly, and anyone can view or download the underlying data. Use it to learn the interface and practice on sample or already-public datasets, not real business numbers.

Tableau publishes a full library of free training videos covering everything from your first chart to Level of Detail (LOD) expressions. There's no login wall — start with 'Fundamentals' and work up to 'Analytics' once you're comfortable with the basics.

This is what separates a Tableau dashboard from a default Excel chart: calculated fields (custom formulas) and LOD expressions (aggregations at a different granularity than the view, e.g., 'average order value per customer' shown next to per-order detail). Both have a real learning curve — expect to spend a few evenings on LOD expressions specifically.

This is the step most DIY guides skip: Tableau Public cannot be used for private business data — full stop, it's published to the open web. To keep a dashboard private, you need a paid Tableau Creator license ($75/user/month, billed yearly — there's no cheaper private tier). If that's a dealbreaker, decide now whether you actually need Tableau specifically, or whether Power BI Desktop or Looker Studio (both genuinely free for private data) get you 90% of the way there.