This handout template is developed by the Tufte-LaTeX Developers, designed to produce handouts according to the style of Edward R. Tufte. This style is characterized by narrow main-text column and wide right margin (containing references, notes, table and figure captions, even small figures), giving the light, clean, and elegant look.
For further information, see https://tufte-latex.github.io/tufte-latex/.
This template was originally published on ShareLaTeX and subsequently moved to Overleaf in October 2019.