Generally you will use the File > Save to save your work with full
information as a .ase or .aseprite file (both are the same, just
the extension is different). Then you can export your sprite to be
used in other programs (a website, videogame, etc.) using File > Save
Copy As to export your sprite to .gif files or a sequence of .png
files. See the Save menu section for more information.
You can see the File > Save Copy As as an export/or publish option, which will remember the latest options you've used in case that you want to save the copy again.
SEE ALSO