This page documents information about Celeste
. Many of the tricks demonstrated here are near impossible in real time and documented for the purposes of creating Tool-assisted Speedruns.
Celeste TASes are made using CelesteTAS, a mod for the game. Installation instructions can be found here.
For detailed information on how to use CelesteTAS to create and watch TASes, as well as gameplay techniques and mechanics, you can access the wiki for the tool here.