There are websites that allow one to work on LaTeX documents collaboratively, much like Google Docs. They also keep the files on their servers, so you can access them from any computer. All have free and paid plans.
This authoritative user's guide and reference manual for the LATEX computer typesetting system has been revised to document features available in the standard software release LATEX 2e. These features include additional styles and functions, improved font handling and enhanced graphics capabilities. Other parts of the book have been revised, also, reflecting several years of user comments and suggestions. Selected sections have been rewritten to explain difficult concepts or function, and the descriptions of both MakeIndex and BibTeX have been updated.