You make money from AdSense. AdSense places ads that match the content of your writing. Advertisers like placing ads through AdSense since they are so highly targeted. Users will click on the ads if they are interested in them. The amount of money you can make depends on the topic. Commercial topics tend to pay more and within commercial topics, categories like finance are among the top earning. I suggest worrying less about the category and focus on areas that you can create the best piece of content on in the world.
Challenges
When you are just starting out with articles and AdSense it takes time to gain traffic. Then, it's usually between .5% and 4% of people that will click on ads. So, earnings can be very small at the beginning. Secondly, you never know how much traffic a piece of content will get. Rarely do we see someone make a hit with their first hub. Instead, they will make a few hubs that get zero traffic and then they will make one that does well. After they have one good producing hub, they are able to see the pattern and create more, but this takes time. I say it usually takes 30 Hubs before they get a reasonable amount of traffic if they have created high quality content and focused on This upfront time investment can be daunting when you don't see results. Getting through this dark period is the major challenge.
