Text Editing in UNIX A short introduction to vi, pico, and gedit
These slides concentrate on vi because it is very fast and always available. Although the set of commands is very cryptic, by learning a small subset of the commands, you can edit text very quickly.
Author(s): Prof. Stewart Weiss
31 Pages 
We are working on the detailed description of this book, we will update this section soon.
Author(s):
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The VIM (Vi Improved) Book (PDF, 572 pages) Mirror
We are working on the detailed description of this book, we will update this section soon.
Author(s):
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