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Found this simple Vi tutorial for the Vim text editor [Ubuntu/Linux] quite useful..
It covers everything from the basics like inserting text for noobs to advanced file manipulations using vi and customizations. You could also check out the developer, Bram Moolenaar’s vim home page, where you can also find a lot of other vim sites and resources.
http://www.apmaths.uwo.ca/~xli/vim/vim_tutorial.html [ Vi tutorial ]