Thanks for the summary of the book. I did notice the numbered sections are missing and duplicating numbers. Upon counting I also only see 8, not nine.
Metalearning: First Draw A Map
Directness: Go Straight Ahead
Drill: Attack Your Weakest Point
Retrieval: Test To Learn
Feedback: Don’t Dodge The Punches
Retention: Don’t Fill A Leaky Bucket
Intuition: Dig Deep Before Building Up
Experimentation: Explore Outside Your Comfort Zone
Edit: I have read the book now and reread your summary and see the problem. You have "2. Focus: Sharpen Your Knife" in there, but it didn't receive <h2> tags. So it should be:
Metalearning: First Draw A Map
Focus: Sharpen Your Knife
Directness: Go Straight Ahead
Drill: Attack Your Weakest Point
Retrieval: Test To Learn
Feedback: Don’t Dodge The Punches
Retention: Don’t Fill A Leaky Bucket
Intuition: Dig Deep Before Building Up
Experimentation: Explore Outside Your Comfort Zone