Simply keep testing and finding low competitive products from Amazon that have perhaps just launched and are about to get big quick and I will quickly write a post or review about the product that has just launched and get this up in the rankings real quick.
Think about Amazon.com products like "Electric Bug Zappers", very low in competition but a high demand product particularly when it first launched many years back, so again check the trend of these products before setting up sites for them.
So when you find something that seems relatively popular do a
search in google.com for those keywords and check the competition. If the competition displays; About 1,000,000 results or lower then you're in business. (You will see the results after you click search underneath the keyword)
Making Money from this by promoting virtual products
If this is done correctly you can make very good money from this. You can use Clickbank trends tool to monitor new products that have just been launched. I like using them because all of their products are virtual and there is no shipping involved, so customers don't have to wait for the goods, its instant.
The idea is to have many niche sites doing this and you will reap the rewards, this is called passive income!
Again you don't have to do it this way, you can simply write an interesting post like "How To SEO Your Blog Posts" and write about steps and discreetly mention the Keyword Winner plugin with your affiliate link so that when readers click the link you get commissions too. There are discreet ways and non discreet ways, I recommend you mix up your posts with both.
Google Trends and Competing Pages
Now one thing I will say is don't focus on how many searches the keyphrase gets with Google ads tool, because REMEMBER, we are focusing on niche with low competing pages of around 1,000,000. (And generally those get between 0-100 searches a day) The only 2 tools we shall use for this example is Google Trends and Competing Pages.
Again you don't have to register loads of domains, you can post a review here and there about a product and optimize that page.