These are guides that will help you learn how to use LaTeX.

IS Guide  usermanual.pdf done with XeLaTeX.

The Not So Short Introduction to LaTeX2e lshort.pdf

LaTeX wiki book http://en.wikibooks.org/wiki/LaTeX

Formatting Information (A beginner’s introduction to typesetting with LaTeX) formatting_info.pdf

Math into LaTeX mil.pdf

A Simplified Introduction to LaTeX latex.pdf

Mathematica in LaTeX https://tex.stackexchange.com/questions/42380/how-can-i-include-mathematica-code-in-a-document/42385mysymdoc.pdf

Maple in LaTeX https://www.maplesoft.com/support/help/maple/view.aspx?path=latexlatex.txt

TeX for the Impatient http://www.ctan.org/tex-archive/info/impatient/

Powerdot (Creating presentations with LaTeX) powerdot.pdf