In addition to the resources available at golang.org there are a range of community-driven initiatives:

• The Little Go Book
• Exercism.io - Go - Online code exercises for Go for practice and mentorship.
• Learn Go in an Hour - Video 2015-02-15
• Learning to Program in Go, a multi-part video training class.
• Pluralsight Classes for Go - A growing collection of (paid) online classes.
• Ardan Labs Training - Commercial, live instruction for Go programming.
• O'Reilly Go Fundamentals - Video learning path for Go programming.
• Go By Example provides a series of annotated code snippets.
• Learn Go in Y minutes is a top-to-bottom walk-through of the language.
• Workshop-Go - Startup Slam Go Workshop - examples and slides.
• Go Fragments - A collection of annotated Go code examples.
• 50 Shades of Go: Traps, Gotchas, Common Mistakes for New Golang Devs
• Free Go Language Workshop Framework Training is running regular free BYOD workshops in London, UK
• GoingGo.net - A collection of videos and articles for learning Go.
• Golang Tutorials - A free online class.
• Rob Pike's 2011 three day course - Day 1, Day 2, Day 3
• The Go Bridge Foundry - A member of the Bridge Foundry family, offering a complete set of free Go training materials with the goal of bringing Go to under-served communities.
• Outlearn.com - Learning Paths for Go.

Learning resources for specific topics:

• LearnConcurrency outlines a course of study of Go's concurrency model and patterns.
• LearnErrorHandling links to resources about error handling in Go.
• LearnTesting links to resources about testing in Go.
• LearnServerProgramming links to resources about server programming in Go.

Further reading:

• Newspaper is a topic based newsfeed for slack. Built on Go