As a course developer and promoter, I can say that on the face of of it, promoting can be easier than developing one. The upside of development though, is that once it’s done, have to do is keep it updated and it can earn you money for years. That’s the case with my SEO copywriter training course, which I’ve been teaching (and earning from) since 2009.

StackPath – CDN with 31 additional data centers (Cloudflare has 150+ data centers, but more data centers = faster content delivery). I get around $1,000/month by referring people to StackPath in my cache plugin tutorials. StackPath recently bought MaxCDN and their affiliate acceptance rate is much lower (depends on your potential volume) but most cache plugins converted to StackPath as their recommended CDN
Mistake #5: Promoting a lot of affiliate products instead of just a few. Once you start affiliate marketing, you realize how easy it is to share affiliate links. Instead of becoming an affiliate for a lot of different products and sharing them liberally, I recommend concentrating on just a few and sharing them intentionally. It doesn’t seem as spammy, plus you can be sure the products you do promote are closely aligned with your brand and message. Deep is better than wide.
My business, Pure Residuals, was developed and launched in July of 2013. It is my primary website, but one of many over the previous 10-15 years of earning real money online. I have made thousands of dollars selling other peoples' stuff for fantastic commissions and I truly enjoy doing it and teaching others how to get started and eventually become a full-time online marketer.
Always disclose your affiliate relationship. Most visitors will probably understand that graphic ads will lead to your getting paid, but if you write a review or use an in-text link as a recommendation, you want your readers to know that may lead to compensation as well. This ensures you retain transparency and trust with your readers, but also, it's required by the FTC's endorsement rules.