There are loads of great resources to learn nowadays. Here’s a list of sites that I’ve found useful.

JavaScript

• Eloquent JavaScript This book has a great introduction to not only JavaScript but numerous computer science topics.

Python

• Learn Python The Hard Way If you already have programming experience this is a great way to see how things are done in Python.

AWS

Big Data & Machine Learning

Physics

• Feynman Lectures Learn from the eminent Dick Feynman. From classical mechanics to quantum mechanics. His lucid teaching style is a fantastic supplement to most modern texbooks.