Atomic Functions or Methods
The sync/atomic package recommends using atomic types and their methods instead of the package-level atomic functions. For good reasons.
Concurrency
Killing Me Softly, Or: How Goroutines Want To Exit
POSIX threads have an array of control functions, goroutines have none. When to exit is a goroutine's decision. Here's how to properly stop them from the outside.
When (not) to call package-level APIs
Package level APIs are convenient, but they aren't concurrency safe. Here is how and when to use them.
Don't Select the Default
In a select block, don't be tempted to add a default case as a "fallback" or it might turn into a busy loop.