The Celeste speedrunning tool allows a save state to be made so a room can be replayed over and over until the room is masterd. Livesplit is a speedrunning timer that can have better splits (shows how fast each level is beat compared to personal record) than the ingame timer. Keyboard input display will show what is pressed on your keyboard. This allows if recorded a person to see their movments and how they could be wrong. The strawberry jam collab has dojos which teach and allow practice of advanceds techniques that a person would want to learn for speedrunning.