Good beginners tutorial to socket.io?

A 'fun' way to learn socket.io is to play BrowserQuest by mozilla and look at its source code :-)

http://browserquest.mozilla.org/

https://github.com/mozilla/BrowserQuest


To start with Socket.IO I suggest you read first the example on the main page:

http://socket.io/

On the server side, read the "How to use" on the GitHub source page:

https://github.com/Automattic/socket.io

And on the client side:

https://github.com/Automattic/socket.io-client

Official tutorial https://socket.io/get-started/chat