Data skills,
learned by doing.

Five tracks, one practice company

Every track uses the same fictional business — VirgoACP, an ACP-sheet distributor — so the orders, reps and products you query in SQL are the ones you clean in Power Query and model in Power BI.

• SQL

  45 chapters · 368 quests

  Query a real Postgres database, from SELECT to window functions.

  SELECT b.region,
         SUM(oi.quantity * oi.unit_price) AS revenue
  FROM order_items oi
  JOIN orders o   ON o.order_id  = oi.order_id
  JOIN branches b ON b.branch_id = o.branch_id
  GROUP BY b.region;

• Excel & Sheets

  9 chapters · 84 quests

  Formulas that do the work — lookups, dynamic arrays, LAMBDA.

  =XLOOKUP(A2, Reps!A:A, Reps!C:C, "Not found")

• Power Query

  10 chapters · 73 quests

  Clean and reshape messy data once, refresh it forever.

  = Table.Group(Source, {"Region"},
      {{"Revenue", each List.Sum([Revenue]), type number}})

• Python

  18 chapters · 143 quests

  Start from zero and write real programs — no install needed.

  sales = pd.read_csv("sales.csv")
  sales.groupby("Region")["Revenue"].sum()

• Power BI

  8 chapters · 58 quests

  Model data and write DAX measures that answer real business questions.

  % of Total =
  DIVIDE([Total Sales],
         CALCULATE([Total Sales], ALL(Products)))

Built for actually learning

• Real engines, in your browser

  PostgreSQL, a spreadsheet engine, Power Query, Python and a DAX engine all run on your device. Nothing to install — and it keeps working offline.

• A tutor that won’t spoil it

  Stuck? Ask for a nudge, then “where’s the problem?”, then the shape of an answer. It explains errors in plain words and never writes the solution for you.

• Remember what you learn

  Quests you struggled with come back after 1, 3, 7, 16 and 35 days. Every wrong answer is kept in a mistake notebook, with what the checker said.

• Projects across tools

  Real business requests — a Q1 review, a messy export, bonus season — solved with SQL, Power Query, Excel, Python and Power BI together.

• Interview practice

  Timed sets of hands-on questions, like a take-home test. See your time per question and send the misses to review.

• Certificates anyone can verify

  Finish a track and get a certificate with an ID. Employers can check it on a public page.

• English, with Hinglish notes

  Every lesson section has a short Hinglish explanation, and the AI tutor answers in English, Hinglish or both.