I love mind mapping. It helps arrange and rearrange new information so a brief glance is enough to spur the memory of the content.
Chapter 2 goes over tooling and setting up the books companion repository.
Chapter 3 goes over the Data Engineering workflow with emphasis on
- the abstractions for getting data into our db “Crawlers” and
- the abstractions we use to store/represent the different data in the db “Data Categories”
chapter 5