Work through those followed by a few project Euler challenges then implement something simple in the domain that you normally work in. For me that's web so I implemented a little HipChat bot.
Also check out usage examples on Sourcegraph (disclaimer: I'm the CTO). We sell our tool to companies to use on their private code, but a side effect is that we've indexed usage examples for just about every popular Go open-source library. For example,
- Go std lib http package: https://sourcegraph.com/github.com/golang/go@bb41b4d599f5758...
- Popular gorilla/mux routing library: https://sourcegraph.com/github.com/gorilla/mux@34bf6dc9faa08...
- Gorp, a popular ORM-ish library: https://sourcegraph.com/github.com/go-gorp/gorp@033bf796a22f...
Cross-repo jump-to-def + find-references = great for making sense of new code.
Tutorial: https://github.com/thewhitetulip/web-dev-golang-anti-textboo...
YouTube series: https://www.youtube.com/playlist?list=PL41psiCma00wgiTKkAZwJ...
Many resources (like my book) are targeting absolute beginners so they are a bit lengthier to read if you are experienced, whereas other great books and whatnot are really hard for beginners to follow so at least expressing your skill level would help me recommend specific resources.