One of the exercise files in the introductory LaTeX course, in French, prepared for Université Laval in Québec, Canada. This one covers classes and packages, starting from the point that line length adjusts automatically to the font size so that the number of characters per line stays roughly constant. It loads fontspec, babel and iftex for XeLaTeX or LuaLaTeX and comes with example .bib files.
Shared under the Creative Commons Attribution 4.0. All credit to Vincent Goulet; the licence comes with the project's files.