Jim Hefferon
Consistent text and maths using concrete fonts
Make plain text safe for use in LaTeX
A document for absolute LaTeX beginners
A short list of go-to LaTeX packages, aimed at a beginner
Unofficial reference manual covering LaTeX2ε
A direction-finder for LaTeX resources available online
Theorem environments that are shaded
Make a web page to compare styles
LaTeX Math for Undergraduates cheat sheet
Creating Venn diagrams with METAPOST