LaTeX is a free open source typesetting program that is particularly good at presenting mathematical symbols, formulas, graphs, as well as non-Roman alphabets better than traditional word processing programs (e.g. Microsoft Word).
- Free & Interactive Online Introduction to LaTeX - if you are new to LaTeX, try Part 1
- Learn LaTeX in 30 minutes - ShareLaTeX
- The Comprehensive LaTex Symbol List by Scott Pakin
- How To Write a Paper and Format it Using LATEX - Harvard University
- A Guide to the Many Flavours of TeX
- A quick guide to LaTeX
- The LaTeX project - Official home of the LaTeX document preparation system
- LaTeX WikiBook - This is a guide to the LaTeX typesetting system. It is intended as a useful resource for everybody, from new users who wish to learn, to old hands who need a quick reference.
- snip (mathpix) - extract LaTeX from PDFs or handwritten notes.