Tutorials are how-to pages: not ideas to understand but skills to use. Nobody reads them straight through — you read the one you need in the moment you need it, and every one of these moments arrives for every student in this course, usually more than once.

When to come back

Stuck at the boards? Getting Unstuck. Sinusoids test next week? How to Study for Math. Just fit a model to data? Checking Your Own Work. These pages are built to be reread.