Ask HN: What are the projects/apps I can build to learn Go Language?

I built this to learn Go: https://cryptowat.ch.

It was the perfect project because it involves a lot of concurrency and networking. I'd think about projects that involve those two things.

I’m not finished yet, but I’m writing a trading bot for Steam so I don’t need to manually confirm trades if the offers are exactly what I’m looking for.

A friend and I built http://usefixie.com/ with it to learn Go. Like artursapek's project, Fixie was a good fit because it involved concurrency and networking, and latency was critical. It was also nice that we could leverage a well-developed open source project (GoProxy).