The studying section should tell people how to correctly use the answer buttons. And warn them not to use Hard as Again. Currently, the buttons are only explained in a much technical way.
Messages from Expertium and David, for future reference:
Easy - you answered correctly with no hesitation. Good - you answered correctly with a little bit of hesitation. Hard - you made a minor mistake and/or you hesitated a lot. Again - your answer was completely incorrect.
When a user is coming to the manual, they likely quickly want to know "what button should I press, and when" They have a task:
I want to answer a card. And they want to understand how to effectively complete this task What a button does is needed in the manual, but the 'why' is more important to the user.
The studying section should tell people how to correctly use the answer buttons. And warn them not to use Hard as Again. Currently, the buttons are only explained in a much technical way.
Messages from Expertium and David, for future reference: