Get a book on applied statistics, such as

Think Stats: Probability and Statistics for Programmers (https://allendowney.github.io/ThinkStats/)

Computer Age Statistical Inference (https://hastie.su.domains/CASI/)

Statistical Rethinking (https://xcelab.net/rm/)

An Introduction to Statistical Learning (https://www.statlearning.com/)

Obviously maths is going to be involved to do the subject justice. These recommendations are more about applied statistics, but that's the foundation. From there it is a small transition to statistical process control.