Saving Files with Vim
Vim can be kind of tricky your first few times using it. Knowing how to save and abort your changes along with being able to exit the editor is a great place to start.
:w
writes changes and keeps the file open.
:x
writes changes and closes the editor.
:quit!
aborts changes and closes the editor.
:w !sudo tee %
saves changes made by an unprivileged user.