This is very good but before throwing people off the deep end I'd suggest this overview (origin of the dx7 & fm synthesis):

https://www.youtube.com/watch?v=sXt_NXjc7oY

And then some bigclivedotcom to get going: https://www.youtube.com/watch?v=6Maq5IyHSuc

EEVblog for intermediate beginner stuff / home gamer lab gear: https://www.youtube.com/c/EevblogDave/videos?view=0&sort=p&f...

And finally some Marco Reps for advanced beginners: https://www.youtube.com/c/MarcoReps/videos

Just to dip your toe in.