A quick way to reload the file without having to close and reopen Vim

command :e (short for :edit)

:edit! means you want discard local changes (changes in Vim) and reload file.

References:

• https://vi.stackexchange.com/questions/444/how-do-i-reload-the-current-file
• https://vi.stackexchange.com/questions/444/how-do-i-reload-the-current-file/13092#13092