In Vim there are many ways to close a file. One of the best is :x, also know as :xit.
:x writes and quits a file when changes have been made, like :wq, but with one less keystroke.
An important distinction:
:x and :wq are similar, but not identical commands.
The difference is that :wq writes the current file and quits, as long as the file is not read-only and has a name, while :x only writes if changes have been made. So, if you were to generate a file with Vim, make no changes, and try to write and quit with :x, the file would not be written. Doing the same thing with :wq would write the file.