Channels

Start with the official Tour of Go: Channels to get the basics down.

Dave Cheney's article on Channel Axioms is a must-read for understanding channel behavior.

If you want to see how channels work under the hood, these videos are fantastic: Как на самом деле устроены каналы в Golang? and Полный разбор каналов в Golang

Source code: runtime/chan.go

Examples: Channels, Channel buffering, Channel synchronization, Channel directions