I have been in the community for like a year and honestly, the most interesting thing was the cause of glitches....it's insane.
Because some of the run has really elaborated route that when you watch you could wonder why it's made like it, but everything in speedruns is done for a reason, if there's no reasons, the runner would actually reset or rerecord in the case of a TAS.
And it's very weird how different you play the game. If I was a speedrunner, pm64 is very fun, but TTYD and spm are really bad in potential and as surprising as it sounds, SS is actually very fun.
It's just a VERY different way to see games