A large amount of the internet is about information of one kind or another. There are services, shopping and games but much of what people look for on the net is information about something they are interested in or want to know more about for all kinds of reasons. People look for medical information about health problems they have, they look for information on products or services they want to buy, they search for ways to make money or save money as well has countless other things. People have hobbies that interest them and try to get information about it. Of course there are arts, music and entertainment that people search for and information about their favorites like celebrities. Other information is basic like phone numbers and addresses of businesses. The point is that much of the internet is about information; that's why some say we are in the information age.
You can make money by providing some of the information that you know or gather. It's best to pick a topic or subject mater that you know something about and interested in. What you will want to do is be the go to person for information on your favorite subject and be a store of information about it. You can make a web site and blog about the information you are providing to those seeking the knowledge you provide.
What type of topic should you pick? What information should you provide? That may not be a difficult decision but it's important. You should pick something you know about so it will be easier to provide good information. It should also be something you are really interested in so you won't get bored with it and it's always easier when something excites you. Should you pick a subject that is large like shopping, technology, or health? Big subjects with unlimited information available? Not likely a good idea because you will be one of many on the net offering the same information and you will not be recognized as a top source. It's best to pick a subject that is more narrow, more specialized and not as large. Dig down to a sub topic of larger topics. It's possible that your subject will not have many covering it and you will quickly be the top source for the information on the net. It's best to be the big whale in a smaller pond then a small fish in the larger sea. The down side to this is that there is less people interested and less potential to profit. However, if it's something that there is money in then you can do quite well. In other words, if the subject is something that people spend money on or advertisers spend money on then you can make money. There are some subjects that have little to do with anyone spending money or buying anything so it's a little more difficult but most traffic to your web site can generate some revenue.
Providing information is what the internet is about, exchanging information, knowledge or ideas. Be a knowledgeable source for some niche of information and you can make some money on the net with your web site and blog.
As time goes on your site will be linked by others that recognize you as a knowledgeable source which will help make your site top ranked and come up on top or near the top in search engines. People will find your site and you will have a stream of viewers, traffic, to your site where you can run ads and have products and services offerings that will interest your readers.