The text editor emacs is powerful and flexible and has so many features, no one ever uses them all. This complexity may seem a little intimidating to a beginner. But knowing just a few simple operations is all that is necessary to get started. Please see the notes on minimal emacs. Once past these preliminaries, a good introduction is the emacs built-in tutorial, which is started with the key combination Ctrl-h t.
The best way to master emacs is to use it. As you use it, experiment with and try out new features. The purpose of these notes is to provide a step-by-step introduction to some of the most commonly used features of emacs. Take them one at a time and, if you find them useful, master them. You will find your productivity improving as you do.