Drive for Uber or Lyft: If you're in a locale where you can find Uber or Lyft (or even one of the many competitors around the world such as China's Didi), you could easily make a respectable income. The hours are flexible and you can work as you see fit, making it perfect even if you currently have full-time employment but are looking to make some money on the side. 
I have been making money online for over a year now. Not in the big time yet, still consider myself to be learning my craft. I was doing it really ineffectively (using adsense and amazon along with a t shirt affiliate deal) and driving traffic almost exclusively though facebook. Probably averaged about $800 a month over the last year, mostly because Christmas brought an absolute ton of t shirt sales)
Use your personal words & experience with the product. Your own content, or photos & videos of yourself using the product are always the most effective. For example, many affiliate programs provide swipe copy to their affiliates which is pre-written emails, post material or social media posts. These can be helpful as a guide, but they often scream swipe copy, aren’t written in your voice (the one your readers know!) and if a lot of affiliates are using it, are overdone.
Now as to your comment on traffic it is true, traffic is important. But the truth is, acquiring traffic is easier than converting it. Plus we have many posts dedicated to traffic generation on this blog. Simply check this post, this post or this post. But must importantly, the reason why people struggle with traffic is that they try to promote a sales page or a heavily biased piece of content. Nobody wants to share that, nobody wants to link to that, and as a result you don't get traffic and blame your lack of success on traffic (like you did in your comment above).
When promoting affiliate offers, just make sure you are fully aware of all the terms and conditions attached to your affiliate program. Some programs can be strict about how they allow you to promote their products. For example, some may limit you to banner ads and links only, while others will allow you to use paid advertising, but won't allow email marketing. 
Affiliate marketing overlaps with other Internet marketing methods to some degree, because affiliates often use regular advertising methods. Those methods include organic search engine optimization (SEO), paid search engine marketing (PPC – Pay Per Click), e-mail marketing, content marketing, and (in some sense) display advertising. On the other hand, affiliates sometimes use less orthodox techniques, such as publishing reviews of products or services offered by a partner.[citation needed]
8. Affiliate Partners Ltd. Affiliate Partners Ltd. is one of the first affiliate networks in the financial industry and is known as the affiliate network with the highest payouts (CPA) up to $600 for niches like trading, gaming, casino, sales funnels and many more. Working with them makes affiliate marketing much easier for you because of their very professional team which is always reachable in skype and by email. This network assures you the best affiliate network experience in the world with extra fast payouts and a 24/7 support.

​Be sure to check what kind of customer support you can expect from your affiliate program once you have signed up. Do your research online and if possible, speak to other sellers using the program to get their thoughts. Can you speak to someone via phone or Skype or do you have to wait 72 hours for email responses? Be clear on this because trust me, you will need support at one point or another. 
Long-tail keywords are search phrases, rather than one or two words. If you are planning to promote an online poker course for example, you might do some keyword research and decide that the term "online poker course" has too much competition from existing websites, but articles based on things like "When to push during a sit-n-go" don't have as much competition and may yield more traffic.
I do have a question, though, you state that longer articles are better (which I understand). I've found a niche that has a few keywords with very high CPC (no real affiliation program can be used though), with a few thousand searches a month. For each keyword I could probably 500 words on each keyword. Should I do this, or should I compile them into one big article? They keywords can be linked to each other, for example, "how to start running", "basics of running" etc. (Those obviously aren't the keywords, and more can be written on those). What would you recommend?
Affiliate marketing has now invaded Hollywood? We know it invaded US politics in Washington as some politicians (current and retired) are silent affiliate marketers or in MLM. Maybe we can look forward to hearing in the next few years about more celebrities going from actors and actresses to home-based affiliate marketers. Wouldn’t that be something?
Medium is an online community where anyone can post articles and essays and get them in front of their audience of millions of monthly readers. While it can be a great place to build your audience for your own blog or find customers for your consulting business, with Medium’s new Partner Program, you can now make money online whenever someone reads your articles. Register for free and you can choose whether your articles are freely available or only readable by those people paying $5/month for a premium Medium membership. You’ll make money based on the amount of people who read and engage with your posts each month.
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