C-h i opens an info buffer with manuals of emacs, installed packages, and all registered texinfo files of the operationg system. There's a lot of additional information at index sections of every particular manual. The org-mode Manual, for example, offers the main index, the keyindex, and the command and function index.

“An important part of any organization system is the ability to quickly capture new ideas and tasks, and to associate reference material with them. org does this using a process called *capture*]]. It also can store files related to a task – attachments – in a special directory. Once in the system, tasks and projects need to be moved around.”

— Manual's Capture and Attachments Chapter

org provides refile, copy and archive commands for moving around. Refile and Copy helps with moving and copying outlines. Additionally, org can parse RSS feeds for information. And finally, Protocols let external programs – for example a Web browser – trigger org to capture material.