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Guides for people who actually use the data.

Practical write-ups on Excel dashboards, SQL, KPIs, and the tradeoffs of every tool we've actually used. No fluff, no "in today's data-driven world".

Excel & Tableurs

Excel

Excel Dashboards That Don't Break When You Open Them on Monday

Real steps to build one from a CSV — pivot tables, slicers, the three formulas worth memorizing, and the moment Excel stops being the right tool.

11 min·Read

SQL

SQL Fundamentals: The Cheat Sheet I Wish I Had on Day One

Everything you'll actually use — SELECT, JOINs, WHERE on dates, IS NULL, LIKE, LIMIT — with examples you can copy and the gotchas that waste an afternoon.

14 min·Read

Graphiques

Data Visualization

Chart Types: When to Use Which (and When You're Wasting a Pie Chart)

Eight chart types covered against the question they actually answer — plus the comparison pairs people Google constantly (bar vs histogram, scatter vs line).

12 min·Read

KPIs et indicateurs

KPI, c'est quoi ? Le guide sans bullshit (avec exemples)

Ce que mesure vraiment un indicateur clé de performance, comment en choisir 3 qui servent à quelque chose, et comment en faire un tableau de bord sans Excel.

13 min·Read

Analytics moderne

Modern Analytics

Augmented Analytics: What Actually Changed and What's Still Hype

A clear-headed look at the modern analytics landscape — augmented analytics, embedded dashboards, the actual data stack — plus how to pick tools that match your team, not the vendor's demo.

12 min·Read