Push User Manual
The Push user manual contains in-depth information on Push 3’s features and how to make music with Push 3 and Live.
You can read about Push 1 and Push 2 in the Ableton Reference Manual online.
You can also access the manual for Push 1 and 2 in your Live installation as a PDF. To open it, launch Live and go to Help > Read the Live Manual.
A PDF version of the Live manual is available here.