Before the series — find your level.

Most people aren't just "intermediate." You might be solid in SQL but new to Python. This finds your level in each skill and builds a roadmap that starts you in the right place.

2020 questions — four each across SQL, Python, Visualization, Statistics and Cleaning, ramping to an expert-level question.

4~4 minutes. Tap to answer. No account, no setup.

→A personalized roadmap. "Advanced" is earned — you have to nail the two hardest questions in a skill to reach it.

Your roadmap is ready.

Here's where you start in each track. Tap any level to override it — you know yourself best.

Your skill tracks

Everyone does these

Shared modules · no level split

Data Cleaning · missing values, types, dupes› Exploratory Data Analysis · distributions, relationships› Statistics for Analysts · mean, spread, correlationnew› A/B Testing · hypotheses, p-values, trapsnew› Communicating Insights · the one-sentence takeaway› Leverage AI · 5 prompts + when NOT to use it› Git & GitHub · version control + portfolionew›

End-to-End Capstone · download the data, build it yourself