General Reference
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LaTex WikibookThis free Wikibook on LaTeX is very helpful with lots of examples and easy to navigate
Finding Symbols
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DeTeXifyDraw a symbol and search for possible matches and find the LaTeX command.
Some symbols have a \usepackage{package_name} command that you need to include in the preamble of your .tex file (before the \begin{document}). This tells LaTeX to use a package that has even more commands. The vast majority of these packages are already downloaded with your tex installation. -
Comprehensive LaTeX Symbol List by Scott PakinDocument listings 14,283 symbols and the corresponding LaTeX commands that produce them. Use only as a last resort.
Tables & Templates
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Table EditorOnline table creator for LaTeX. Enter data into the cells to generate code for table is LaTeX, html, Mathematica, and more.
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LaTeX TemplatesTemplates for creating books, articles, assignments, resumes, and much more in LaTeX.