If you're serious about making money online, start a blog. Blogging is one of the easiest and most sustainable income sources. As long as the blog is setup the right way, in the right niche, with the right content targeted at the right audience, and the offer is complementary to the content, you could make a tremendous amount of passive income from a blog.
Otherwise, it’s as easy as adding a link to the video description and asking people to click on it. Coupon codes are a huge bonus (if your affiliate offers this) since often times, you can give people a discount using your custom code, while crediting you the sale, without them even having to click your affiliate link. This results in higher conversions. (Tyler Moore does this).
Affiliate Disclaimer – if you sign up for SiteGround with my affiliate link I will donate a good chunk at no expense to you. Each year I donate $3k to GoFundMe campaigns (2018 was to feed the hungry in Denver, 2017 was to Red Cross at Hurricane Harvey). Your support helps and I genuinely appreciate it. I try to make my reviews unbiased and backed by evidence in the form of Facebook polls, tweets, and real conversations. If you don’t want to use it, here’s a non-affiliate link to SiteGround. Either way I truly believe they are a stellar WordPress host and your site will run faster/smoother… do your research on Facebook groups + Twitter and you’ll find most people say the same.
To earn from affiliate marketing takes a lot of work so don’t expect instant results. You need to know how affiliate marketing works, get the right product, create the platform and run the most suitable ads to generate quality traffic to generate leads. If you don’t get it right the first time, don’t worry, you can try it again and improve your mistakes. Remember that learning from other affiliates would help you overcome a lot of errors as well.
For example, we regularly create content on the topic of "SEO," but it's still very difficult to rank well on Google for such a popular topic on this acronym alone. We also risk competing with our own content by creating multiple pages that are all targeting the exact same keyword -- and potentially the same search engine results page (SERP). Therefore, we also create content on conducting keyword research, optimizing images for search engines, creating an SEO strategy (which you're reading right now), and other subtopics within SEO.
This was all free information I found online in less than an hour, that gives me some great ideas for content, partnerships and potential tools to build into my site to be relevant and useful to my target audience. Of course this is just some quick loose data, so I'll emphasize again: be careful where your data comes from (try to validate when possible), and think about how to use your data wisely.
I will give you a very simple example. Let’s say you build up an audience of 50,000 readers and out of that 50k you have about 1% that trust you (1% of people that trust you online is actually very huge), so that equates to 500 readers. Out of that 500 readers you will have about 10% that will buy your eBook and other affiliate products, so 50 people total. So, if you are selling your eBook for $10, you will make $500. Of course it doesn’t stop there, those people that buy the eBook and like it will most likely recommend it, and you will have a snowball effect where more people keep buying your book and other affiliate products. This is just a rough example that shows you some realistic numbers. Do not ever think that if you build up a huge number of readers that they will all trust you and buy the products that you promote; if it was that easy everyone would be a millionaire by now.