One of the best things in this craft is that, there is only something that you wil learn from other clever people working in really amazing projects. Recently, githhub announces[0] their beta official cli and guess what? It's made in Go. Then, if you want to check what best practice the github team apply when developing a Go application, this project is a must to check.

[0] https://github.blog/2020-02-12-supercharge-your-command-line-experience-github-cli-is-now-in-beta/