Video game speedrunning communities play a crucial role in preserving gaming history and techniques by meticulously documenting strategies and glitches that are discovered during speedruns. These communities often create detailed resources such as guides, video tutorials, and forums where players can share their knowledge and techniques. Additionally, speedrunners often uncover hidden content or unused features in games, shedding light on the development process and providing insights into the history of video game design. Overall, speedrunning communities help to ensure that the knowledge and skills required to complete games quickly and efficiently are passed down to future generations of players.