I have a friend who climbs with another group. She recently had her first couple of experiences as lead climber (sport climbing).
Fortunately, she's eager to learn, and she's an avid reader.
However, being mostly a self-taught climber, I find it hard to sum up all the basics you need to know.
Other than lending her my books, what are the essential key-points she should be taught?
Edited to add that this is for sport climbing.