Chapter 3 is an introduction to supervised machine learning via naive Bayes. And Chapter 8 is demand forecasting using triple exponential smoothing (Holt-Winters).
The first 5 minutes of the first video have garbled audio, but the tech fixes it before too long. My apologies.
To follow along, download the spreadsheets for chapters 3 and 8 from the downloads section of the book's website:
You'll need to unzip these spreadsheets and clear some data out of them per my instructions in the talk. Also, you'll need access to spreadsheet software.