If you wanna learn more about the stuttering mechanism, there are a lot of good books out there. But we still dont know everything about stuttering and how it works or exactly what happens, so I wouldnt get too hung up on trying to figure out every piece of it. Would be better just to keep telling yourself it's just something you do some of the time and that it's ok when it happens. The podcast has a ton of episodes with top SLPs so you can peruse at your leisure.