There are no special skills that are required to do this job. If you can write, capture the attention of the millions of Internet users and potential customers, and direct them to products and services of these companies, you are going to make money. It does not cost you anything to do this writing and to place your articles on the Internet. If you can review products, provide tips and advice to people, write information pieces. You have the potential to make money. You can do all this online work for free and end up making money when these potential customers visit other sites based on your writing. It does take some persistence and you must keep writing but it can be done. The time and the energy is coming from you and your profits come from the companies that your writing has inspired someone to visit another site.
Just as a quick example of how this works, let's say a individual is looking for a new bed for their dog online. You have written an article on what to look for in a dog bed and five tips on how to buy a dog bed. The person reads your article, visits a pet supply store and buys a new bed for their dog based on your article. You earn money from the pet supply store. Everyday there are millions of people looking for products and services and they search the Internet for help. You can provide that help in the form of articles, reviews, and stories. You can start right away with online work for free and doing affiliate marketing.