Emacs was written initially by Richard Stallman at MIT. One of the objectives was to provide a free, expandable and powerful editor that would actively support the most common editing tasks. The result is overwhelming. Emacs is the most useful tool for any programmer with the premise of doing high quality work productively. In this section, we will only see a glimpse of the myriads of possibilities emacs provides. But it will be enough to get you on the right track to learn more.
In this section, it is impossible to fully describe emacs. I tried to identify the tasks, where a rich repertoire of commands can substantially improve productivity. Further, knowing how to find more information is also important for finding new useful commands. Identifying what would be useful and then looking for the feature are the first steps of Amortized Productivity.