Guillermo Rauch, creator of socket.io, imparted knowledge on the real-time web at SIGNAL 2015, focusing on achieving fast and self-updating interfaces. He discussed topics such as Google Docs' transition to real-time, vi's terse commands, maintaining up-to-date real-time interfaces, and the benefits of rendering HTML on the server and taking over with JavaScript in building fast web applications. The video is highly relevant for building real-time features like IP Messaging and can be found on the SIGNAL 2016 website, where attendees can also join the conversation and receive a discount on tickets by using code PNASH20.