Key moves tell the MoveTrainer® to teach you a variation/line from a specific point only.

Each variation in an opening course can have up to two 'Key Moves'. By marking a move as key the course creator allows the students of the variation to start studying it from the key move and up to the other key move.

So for instance, if your whole course is based around 1. e4 e5 2. Bc4, you or your student may want the option to skip the first two moves and study only after them. To do this, you would mark Bc4 as the key move. You can also mark a key move later on, and study would then finish on that move, so if you had 1. e4 e5 2. Bc4 Nf6 3. d3 Nc6 4. Nf3 d6 and you marked Bc4 and Nc6 as key moves, a student would only learn 2. Bc4 Nf6 3. d3 Nc6; the key moves will always begin from the white move.
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Course owners have an automated key move marking script under "Course Owner's Control Panel -> Ensure Quality", and we suggest they use this as then the MoveTrainer® will automatically mark the appropriate moves.