how many ways to earn money online?

I know the following: 1. earning via activities as you do in mylot. 2. writing articles (there is upfront payment and based on views). - you can either setup your own site or - write in sites like Triond, Bukisa, ExpertsColumn 3. working on projects, there are many sites that offer projects and you bid for them. 4. trading - setting up mini stores in site like eBay.