“Vim is a text editor written by Bram Moolenaar and first released publicly in 1991. Based on the vi editor common to Unix-like systems, Vim is designed for use both from a command line interface and as a standalone application in a graphical user interface.”
From: Wikipedia.org
The vi/vim editor – Lesson 1
The vi Editor – Lesson 2 – Navigation Commands
The vi Editor – Lesson 3 – Inserting Text
The vi Editor – Lesson 4 – Deleting Text