What do you want to earn? Is this just a little bit of side income on your hobby blog or are you trying to replace your full time income? If you’re trying to go big then you’re going to want to focus on more high-quality products with big commissions. Maybe you will be building your site or blog around the specific product you want to promote, like a product review or comparison site.
Creating and selling courses on your blog can be a successful way to make money online. The course itself should be relevant to your blog, and based on a topic that will benefit your audience. Although it may take time to create the course in the first instance, once completed, you can then repeatedly make money from the course each time you sell it.
1. I think the effectiveness depends on the niche. It is a tough question to answer. It is best to use each of the methods and if you can segment out when you do each of the linking methods you might be able to get a clue about which methods work best for your niche. I will add that blog comments do add a very positive component – more diversity in the linking domains. Sure, they are no follow backlinks but there might not be a better way to get links from hundreds of different domains.
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.