We have written a lot about Facebook and Instagram marketing on our agency blog. No source will give you 100% what you need as the best experience is learning on the job. Plus getting taught any skill... including marketing...for free 100% is hard.
This is the only course I would recommend. Although enrolment is currently closed (although you can join the waitlist).
Check out Mojca (the person behind the course) over on Twitter too, as she shares some fantastic Facebook Ad stuff there.
Hope that helps - Gareth