Any consensus on 'the best' online Music Theory course?

Good day all. Over the last year, I've come to realize that there is a great deal of formal training in my music. Started looking at various online courses as well as local college and university courses. I'm pretty serious about taking my knowledge to the next level and thought that this forum might offer a nudge.
So.. anyone have a favorite music theory source / class that they'd recommend?
Thanks to all.
Al