Free cheat sheets
One page each, made for people who learn by building. Download, print or keep them open while you work. No sign-up.
- Python · Beginner
Python basics
Types, strings, lists, dictionaries, loops, functions, files, errors and classes on one page.
- SQL · Data analysis
SQL basics
Select, filter, join, group, CTEs and window functions, with the order SQL really runs in.
- Pandas · Machine learning
Pandas and machine learning
From loading a CSV to cleaning, grouping, training a first model and checking it.
- Advanced · Time series
Time series forecasting
Trend, seasonality, ARIMA, Prophet and how to check a forecast honestly. One page, built from the same work as my S&P 500 forecasting paper.
Coming soon
How to use them
Each cheat sheet fits on one A4 page. Open its page to see what is on it, then download the PDF. They are quick reminders for the things you reach for every day, not full courses, so use them next to your editor or notebook while you practise.
New sheets are added as I make them. Each one has its own page, so you can link to it or share it.
Want more of these? Follow me on YouTube and Instagram, or try the free data tools.