I've enrolled in ton of courses (including FB Ads), I've even asked for some info on those in this forum. Even though, 90% of all FB Ads related courses were a total garbage. What I mean by "garbage"? It's the super-basic info you can find on Youtube for free on random channels on "fb ads", etc.
Talking about free YT channels to checkout on FB Ads, personally, I've watched these ones: Tristan Broughton, Gabriel St-Germain (more related to ecom, but you can gather ton of useful info from him).
Now, for courses: Wilco de Kreij, Maxwell Finn, also a webinar by Molly Pitman and Ezra on FB Ads 2019 (great webinar with great tips, even though they will sell a service at the end of it) -
https://landing.smartmarketer.com/pages/new-facebook-ads-strategy-replay
Back in time, I found these the best for me, and in addition to Molly Pitman webinar you can revise your strategies for 2019. Even though, it's best to just take what you learned into practise and see, where you're failing and where you might need to improve yourself.