How to Make Money Blogging
Blogs earn money primarily from selling advertising space. These advertisments may be in the form of adsense ads, or through paid advertisers.
Affiliate marketing is the second most common way of earning money a blog. The blog may link to products that other websites are offering. The blog owner is not paid to display these links or banners, but they do receive a commission on sales through their affiliate link.
Paid reviews
There are companies that will pay you to provide a favorable review of their product. Because you are being paid you do have to include a disclaimer stating that yes, you where paid to do this review. In the
Things that make you go hmm blog you can see a example of a paid review, and learn more about how they work.