Have in-depth knowledge in your niche? Package it up into an ebook and sell it on your blog. I'd generally advise against selling it (at least exclusively) on Amazon or Kobo, as you'll probably be able to charge much less. If you've already built up a solid audience, you can probably change anywhere from $5 for a very short one, all the way up to $39+.
Affiliate marketing is my absolute favorite way to make money blogging. I love it because it can feel quite passive. You can create just one blog or social media post, which can potentially still earn you money years down the line. Now, you will have to maintain the post and keep generating traffic to it. Still, with affiliate marketing, I can relax a little and enjoy life more, all while knowing that I am earning a great living promoting products that I use and enjoy.
The reason this section is called “Great Content” is because your content really does need to be of a high standard. Everyday millions of blog posts are published on the internet and with so much competition for our limited attention spans you really have to be creating blog posts people are going to want to read and perhaps even share on social media or on their own blogs.
If you are using a free blog hosting service instead of your own domain name, you must provide high quality content with a limited number of relevant links or risk being shut down. If you are only interested in writing short, quick product reviews in order to earn money, you will need to host your own blog. Be warned that low-content, high-link blogs are a less reliable, though lower effort, way to earn money.
The answer is yes. However, I would caution against it. The reason is, when you use a free service, you don’t have as much control over your blog—the free service does. This can be risky, especially if you will rely on your blog for income. A self-hosted WordPress blog is my recommendation and can be started very inexpensively. See my step-by-step tutorial here.
If your niche doesn’t allow you to promote or build premium products (anything over around $100 per unit) then think about getting a solid mix of offerings and building it up over time. I remember Darren Rowse saying that initially Amazon Associates was a really small source of income but over the years it has really started to add up. Think eBooks, affiliates, consulting, books, etc. and you’re starting to build an income stream.