Serious question - where would you start if you wanted to learn about how to do find/diagnose this types of issues and maybe one day work for project zero. Ever

Serious question - where would you start if you wanted to learn about how to do find/diagnose this types of issues and maybe one day work for project zero. Everytime I see these posts it blows my mind, maybe because I have never done any kernel development, but I tend to get the feeling these guys/girls must be the best of the best.