An important collection of the 15 best machine learning cheat sheets.
Supervised Learning
Unsupervised Learning
Deep Learning
Comprehensive Stanford Master Cheat Sheet
Linear Algebra and Calculus
Data Science Cheat Sheet
Keras Cheat Sheet
Deep Learning with Keras Cheat Sheet
Visual Guide to Neural Network Infrastructures
Scikit-learn Cheat Sheet: Choosing the Right Estimator
Tensorflow Cheat Sheet
Machine Learning Test Cheat Sheet