I'm fairly new to speedrunning, and I've decided the first game I should seriously start with is this one. Looking at the leaderboards for levels, I see people effortlessly no clip through the floor and instantly reach the end of the level, but when I try, it can never seem to work. What type of technique do professional runners use to perform these, and how are they found? Is there a place where well known glitches are documented? I feel like I'm missing a crucial piece to being able to speedrun well, so any help would be appreciated.