Learn anything

Full courses

From one question to a course that builds to it.

A plan you approve, then lessons that build to what you asked.

Your standard course is planned

Check the lessons and the depth, then start. Nothing is written until you do.

You asked: “How does quicksort work?”

Standard course4 lessons · ~36 min · 1 skipped

A course of 4–6 lessons in 2 units, with checkpoints and a teach-back. Changing it plans the course again.

1. Divide and conquer in one pictureWhy splitting a problem in two makes sorting faster.~9 min
2. Partitioning around a pivotMove smaller items left and larger ones right, in one pass.~9 min
3. Recursion does the restSort each side the same way until nothing is left.~9 min
4. Choosing a good pivotWhy a sorted list is the worst case, and how a random pivot fixes it.~9 min
5. Quicksort or merge sort?When each one wins, in time and in memory.~9 min

The real thing, not a picture of it. Try it.

Every lesson is listed before it’s written, with its goal and how long it takes. Reorder it, drop what you know, or change the depth.

Each lesson starts from the one before, so by the end you can do what you asked about, not just recognise it.

Courses keep your place, your answers and what’s left, on any screen.