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.
Use a contextual ad service. Once your blog contains high quality content and has begun to attract an audience, you can make money using Google Adsense, WordAds, or any other contextual ad service. These automatically generate ads in the amount, size, and placement you specify, matching the ads chosen to the topics you write about. The more readers who click on the ads shown on your site, the more money the advertisers will pay you.
Email is a great way to deliver other forms of content. With Convertkit, I am able to also create free email courses that can automatically be sent out to my subscribers. This makes life easy because all a reader has to do is sign up, and then Convertkit sends out all the information that they need and drips out the content day by day (or whatever timeframe I choose).
One attractive feature of promoting digital information products is that the commissions tend to be higher than that of physical products; ranging anywhere from 10% to 50% or even higher. As an example, if someone is selling a digital information product for $500 with a 50% commission - you can earn $250 per sale. This is much higher than commissions on physical products due to the high profit margins.
Narrow down the topics by reflecting on profitability and other goals. In order to make money, you'll need to find a niche that other people haven't filled already, but is still popular enough to attract a significant number of visitors. Also consider other factors, such as money you'd have to spend if your blog focused on reviewing products that you in turn would have to buy.
Once you setup your account on AdSense you will be given a code to add to your blog. This code will automatically display advertisements on your blog from companies who are part of Google’s advertising network. You may see ads from small companies related to your topic, or you may see ads from large companies that are completely unrelated to your topic.