In case you don't want to view the whole thing at one sitting (it's a bout 90 minutes), the video is organized as follows (I reference the numbers in the Table of Contents):
- Sections 1-13 (roughly from the beginning to 38 minutes in - the "math" risk and return (Expected Returns, Standard Deviation, Covariance, and Correlation)
- Sections 14-25 (from minutes 38 to 75): Markowitz Portfolio Theory and the Capital Market Line
- Sections 26-32 (Minutes 75 to the end): Systematic and Unsystematic Risk, The CAPM and the Security Market Line