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Courses

A course is four to eight short lessons for one kind of reader, each lesson a few minutes of narration you can also read, a diagram, and a self-check with a source behind every answer. Every fact in a lesson comes from a page on this site — the lesson teaches it, the page proves it.

Start from who you are

Follow a learning path

A path is the courses for one audience in the order to take them.

Or pick a module

Levels: orientation, operate, configure and own. Each course page says which it is and what you can do by the end.