One of my favorite books from last year was Angel: How to Invest in Technology Startups--Timeless Advice from an Angel Investor Who Turned $100,000 into $100,000,000 by Jason Calacanis. It was actionable, no-nonsense, and really informative. I loved the crisp and clear framework and suggestions; the reader can agree with them or not, but at least it's practical and direct.
I just started getting my feet wet in angel investing last year, and I plan on spending the next 6 months doing a deep dive into it as a personal experiment for myself to see if I like the process and the work (Jason's motto in the book is "do the work").
Below are my main takeaways and notes on the book. (One telltale sign I liked a book is when my notes Google Doc is 15+ pages long, as it is for this book.)