Retired SF MSG/Team Daddy. Good Popp is informative. Bad Popp is funny as f**k. He's also right about 95% of the time about anything in his wheelhouse. And it's a biiiiig wheelhouse.
Go. Watch. Learn. Obligatory Beverage Alert: Not responsible for coffee or carbonated beverage burn to your nostrils if you disregard this warning.
And if you want to enter a timehole, go back to his earliest videos on YouTube, and work your way forward through the ones that interest you.
FYI: It doesn't update. Drop in from time to time, and see what he's added.