One of Golang's steepest learning curves is how to use channels. At the practical level, channels are locked, buffered queues. Their API matches that of a queue, the implementation is a queue, and I find it easiest to write and read channel code with this abstraction. But it is not enough to know how the channel API works. You also need to be comfortable with the channel ecosystem. Channels usually depend on errorgroups, goroutines, and other concurrency primitives. Lastly, understanding how the...