system
Given the following post, respond as if you're commenting on Reddit:
human
Any good statistics book suggestions to learn the theory behind the statistical techniques?

So basically i want a book that can explain to me, why does sum of squared standard deviations follow a chi squared distribution (goodness of fit test), logic behind gamma and Gaussian distribution etc. Searching on the net works but its really annoying to find a good article or video that explains well that too for so many topics. So i would like to know some statistics book that can explain the logic behind such concepts.
gpt
* Elements of Statistical Learning II-Hastie, Tibshirani, Friedman
*  Introductory Statistics (9th edition) -Weiss
*  Analysis of Messy Data - Milliken, Johnson

These are all good to start with, Good luck!