That's it! Congratulations on finishing this chapter. You should now be familiar with almost all organization features. Creating teams, inviting people, and managing repository access should feel much more easier.
If you found it difficult to follow, I would recommend you to just play with it, make a test organization, and go through the chapter again. Full disclosure, this is how this chapter was written. I created an organization, a second test user, and through trial and error this chapter was born. Given that GitHub has released new organization features in beta, I had to do a lot of testing. I think the result was worth the effort.
In the next chapter, we will explore GitHub's strongest point: collaboration and pull requests.