Some of these courses are excellent, but you're are building a risky business if it is based just around Facebook Ads or just Google. Yes, there's no doubt that Facebook or Google are great platforms to get leads and customers from, but what happens when they suspend or close your ad accounts?
You can literally lose your business overnight and it reminds of me of the Ad-sense gold rush about 15 years, when people were quitting their jobs because of their Ad-sense earnings, only to get their Ad-sense accounts shut down.
The key to survival online is diversification. My rule of thumb is to never have ONE traffic source responsible for more than 25% of the traffic for a certain product or affiliate offer.
If one traffic source gets shut down, it's okay because you STILL have 75% of traffic going to the offer. You're still in business.
Putting all your eggs in Facebook ads or Google is a recipe for disaster. If You already have a well-built, engaging Sales marketing funnel for a certain product you offer unique bonuses not offered by others look around and test....test...test! Twitter, Bing, Yahoo, Pinterest, Linkedlin