Data Science

All Cheatsheets You Need

Supervised vs. unsupervised learning
To learn how to choose the right approach and data labeling technique for your ML projects, check out the white paper by Alegion below:

Python

Beginner

Book: Python Data Science Handbook
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Book: Python for Data Analysis
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Intermediate

Book: Data Science from Scratch: First Principles with Python
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Book (updated): Hands-On Machine Learning with Scikit-Learn and TensorFlow
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Other

Visual Intro to Pandas and Numpy
A Visual Intro to NumPy and Data Representation 
A Gentle Visual Intro to Data Analysis in Python Using Pandas
Visualizing Pandas’ Pivoting and Reshaping Functions

R

Book: An Introduction to Statistical Learning: with Applications in R
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Purchase on Amazon

Topic: Probability and Statistics

Statistics Made Easy with R Cases
Probability Theory (PDF to Download)
Common Statistics Models (Web Pages to View)
Data Science Fundamentals — A/B Testing
5 Probability Distributions Every Data Scientist Should Know