The absolute easiest way to make money online is with Affiliate Marketing. You don't have to create a product, set up a shopping cart and merchant account, do customer service, work with clients, etc. It's very much like a traditional commission-based sales job where you earn commission on any sales you refer. Just as one example, you can promote a web hosting affiliate program and earn commission on every new account sign-up.
The difference is that you're doing it online, and you can do it from home without ever doing in-person or phone sales. You simply recommend products and/or refer people to specific merchants through the content on your website.
The method I prefer is creating SEO Content, or content that is optimized to rank well in the major search engines. People find it when they are searching for that, click through, and buy what they need or want. This works really well because you write the content once, and it continues to rank well and earn you money for years to come. As long as you maintain your search engine rankings.
Thanks and Regards,