Exploratory Data Analysis - NIST Very good intro to several concepts. Probability Distributions - NIST - Comprehensive, with good explanations Classical Statistical Methos - NIST There are tons of tests to be used in different circumstances. These are very good as reference. (No need to memorize, but good to be aware that these exist.)
Practice Basic Stats in Colab Several good explanations, esp the illustrations
Elements of Data Science - Allen Downey’s entire Book is excellent