In the list below, I have tried to include some resources online that I find myself coming back to again and again. So, it serves like a bookmark for me. They include topics from computer science, physics, philosophy, and life.

Resource Description Category
Projects for an Operating Systems Class Based on courses taught at the University of Wisconsin-Madison, this repository contains a collection of projects that cover a wide range of topics in operating systems. Operating Systems
500 lines or less Focuses on the design decisions that programmers make in the small when they are building something new from scratch. Programming
Andrej Karpathy's Blog A great resource for learning about machine learning and deep learning. His videos on youtube are also great resources to help you build everything from scratch. Machine Learning
Hacker News News and discussions about technology and startups. Technology
Paul Graham's Essays Essays on technology, startups, life, and programming. Technology, Philosophy, Life
Writing Examples Learn From the Best Writing of All Time Writing