Link: http://probabilitybook.net/
Authors: Blitzstein, Hwang

(skimmed)

Contents

1. Probability
   1. Sample space
   2. Event
   3. Naive probability
   4. Probability space
   5. Frequentist vs. Bayesian probablity interpretation
   6. Probability function
2. Conditional probability Concept: incorporate observed evidence into previously held belief
   1. Bayes' rule