We have taken a look at how to extend Confluence with a plugin. We have learned how to set up our IDE and build our first plugin, creating a new Confluence macro.
We have also seen that Confluence has over 30 extension points that you can use enhancing Confluence with your features. This chapter should give you a head start when you start building your own plugin and a general sense about the possibilities.
With that, you have all the essentials to work with Confluence and make the tool essential to your company. If you are ever stuck, you'll find me, and many others in the community, on Atlassian Answers (https://answers.atlassian.com).