• Tobias Oetiker, Hubert Partl, Irene Hyna, and Elisabeth Schlegl, The not so short introduction to Latex

• Peter Flynn, Formatting information. A beginner's introduction to typesetting with Latex

• LaTeX tutorials - a primer , from the Indian Tex User Group

• The art of Latex , from the Chinese Tex Society

• Michael Downes, Short Math Guide for Latex

• Keith Reckdahl, Using imported graphics in Latex and pdfLatex

Online editors and collaboration tools

• ShareLaTeX

• The Basics of C Programming ,   (pdf)

• Learn C The Hard Way

  "Learn C The Hard Way will fill in the "beginning programmer" gap in the literature on the C Programming language. It will teach good modern C programming practices and avoid habits that lead to buffer overflows, security defects, and other problems that even experienced programmers cause."

• Tony Zhang, Sams Teach Yourself C in 24 Hours

• Paul Gribble, C Programming Boot Camp

  Github repo for this course: https://github.com/paulgribble/CBootCamp.git

• Nick Parlante, Essential C

  "Stanford CS Education Library: A 45 page summary of the C language. The coverage is pretty quick, so it is most appropriate as review or for someone with some programming background in another language. Topics include variables, int types, floating point types, promotion, truncation, operators, control structures (if, while, for), functions, value parameters, reference parameters, structs, pointers, arrays, the preprocessor, and the standard C library functions."

• Mike Banahan, Declan Brady, Mark Doran, The C Book ,   (pdf)

  The online version of The C Book, second edition by Mike Banahan, Declan Brady and Mark Doran, originally published by Addison Wesley in 1991.

• C reference

• The International Obfuscated C Code Contest

• Sanjoy Mahajan, Street-Fighting Mathematics - The Art of Educated Guessing and Opportunistic Problem Solving , 2010

• Sanjoy Mahajan, The Art of Insight in Science and Engineering , 2014