William Chen has created a good 10 page Probability Cheat Sheet to help guide you through. The content is based on “Harvard’s Introduction to Probability”.
The cheatsheet summarizes important probability probability concepts, formulas, and distributions, with figures, examples, and stories.
There are also 16 Data Science books listed on his site. A couple of which cover statistics and probability.
Some other Probability resources to get you started:
- Basic Probability – BBC Skillwise
- Bitesize Probability – BBC Bitesize
- Probability and Statistics
- Coursera – Probability