I'm happy to provide resources if I have them! This is made slightly complex by that LARP is extremely broad, so there's a lot of territory to go over depending on exactly what you would like to know or what your goals are.
Most of the resources I have are woefully out of date, but my girlfriend recommends Crash Course's video: https://thecrashcourse.com/courses/larp-crash-course-games-26/ it's still a bit out of date, especially on some of the terms, but covers a lot of ground in a short time.