Read? How to know you have achieved Mastery?
How do I know?
Uncle8888 has been tracking and measuring so he has 20 years worth of data points to review.
He also has his war chest deployment plan ready for the next bear market.
He then stress tested his investment portfolio for the next crisis!
Compare the last crisis actual with the stress test result for the next crisis and se what is difference?
Mastery is the difference!