Ultralearning: Master Hard Skills, Outsmart the Competition, and Accelerate Your Career
by Scott Young, 2019

Anecdotal, but somewhat helpful. Wish he had more examples/data to draw from. The goal is to teach you how to learn a lot of hard things in a short amount of time.

Principle 1 – Metalearning: First Draw a Map
Principle 2 – Focus: Sharpen Your Knife
Principle 3 – Directness: Go Straight Ahead
Principle 4 – Drill: Attack Your Weakest Point
Principle 5 – Retrieval: Test to Learn
Principle 6 – Feedback: Don’t Dodge the Punches
Principle 7 – Retention: Don’t Fill a Leaky Bucket
Principle 8 – Intuition: Dig Deep Before Building Up
Principle 9 – Experimentation: Explore Outside Your Comfort Zone

When: The Scientific Secrets of Perfect Timing
by Daniel Pink, 2018

Some interesting tidbits, but ultimately tries to accomplish more than it does. Many topics, such as the closing chapters on synchronization, really fall outside the purview of “when.” Audiobook read by the author, which was actually not a negative for once.