Ask HN: Good Golang Codebases to Read

Inspired from the askhn post on good C++ codebases to read, asking a similar question about golang codebases.

I've been writing in golang since the past year but I realize there is a lot I can improve in the way I'm writing code especially in golang. Really interested to know the best practices to be followed and I would be very grateful if you folks can share some good code bases to read where I can get better. Thanks again