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I have been studying ML for over a year and am actually a Bachelors of Statistics myself and am sick of not knowing the beauty of the Gaussian distribution and why it is so prevalent in nature. I've encountered it in machine learning, Bayesian estimation, mathematical approximation but have never found a great resource to really get it. All I find are hand-wavy introductions to it which state a theorem here and there but never expound on the full power.
I ask you guys to recommend me resources so I can fully understand the normal distribution, its origins and why it so prevalent. I also want to know what's the deal with covariance matrices in multivariate Gaussians and how its determinant ended up there. My professors, peers and almost everyone seem to take it for granted but it really want to 'get it'.
Would appreciate recommendations all forms, not wayyy mathematical, but a sure, giving a strong grasp.