Learning paths

Follow a web request from the bottom up, from how a device gets an address and its packets cross NAT and the routes of the internet, to DNS names, reliable TCP connections, TLS encryption, HTTP and the newer QUIC and WebSockets.

Start with the mathematics of public and private keys, see how TLS uses them to protect every connection, then learn how websites store passwords safely and how OAuth lets apps act for you without ever seeing your password.