Hello there!
i wanna know, what is the most advanced rigging course out there?
there is one?
For character rigging I highly recommend humane rigging , it’s for 2.79 but you can translate that in 2.8.
There is also DanPro channel on youtube.
if you are more on mechanical rigging there are other resources.
There isn’t ultra advanced tutorial / course that I know of , but if you know the basics well it’s easy to escalate on more complex stuff , it’s not that different, just more complex .