Every byte of a TLS connection explained and reproduced.
In this demonstration a client connects to a server, negotiates a TLS 1.2 session, sends "ping", receives "pong", and then terminates the session. Click below to begin exploring.

If you’re a self-taught engineer or bootcamp grad, you owe it to yourself to learn computer science. Thankfully, you can give yourself a world-class CS education without investing years and a small fortune in a degree program 💸.

There are plenty of resources out there, but some are better than others. You don’t need yet another “200+ Free Online Courses” listicle. You need answers to these questions:

Which subjects should you learn, and why?
What is the best book or video lecture series for each subject?
This guide is our attempt to definitively answer these questions.

TL;DR:

Study all nine subjects below, in roughly the presented order, using either the suggested textbook or video lecture series, but ideally both. Aim for 100-200 hours of study of each topic, then revisit favorites throughout your career 🚀.