Congratulations! You've gone through the first tutorial in this series on learning to use Emacs. You've learned all the most important basics of the Emacs editing environment: how to open new buffers and save them to files; how to move through buffers, enter and edit text in a buffer, and mark and operate on regions of text; and even how to use the mouse for text operations.
Although this tutorial covered a lot of ground, you have a lot to learn. Further tutorials in this series take you through the complex editing features of Emacs and show you how to use them in your work.