Learn it in order, one step at a time

Yes. Every lesson is free to read and you do not need an account.

Yes, on this device: a lesson counts as done once you reach its end, and the path's page then offers to resume at the next one. Nothing is sent anywhere, and you can mark a lesson done or not done yourself.

You can open any lesson from the path page, but they are written to be read in order: a later lesson may rely on something an earlier one set up.

A learning path takes you from a first step to a goal. A series is a set of related pieces on one subject. Both list their lessons in order. Browse all topics for single pieces.