Best way to make money online legally is by google adwords. you can also go for PPC SEO through Email Marketing . For more information please visit this link http://www.americanrattan.com/
It all depends what you are trying to sell, and how good you are at it What works for one person may not necessarily work for another It helps if you have a passion for the product/service And ofcourse it's all about getting traffic
According to me the best way to make money online is by becoming a freelancer. Freelancer are the people who do their work sitting at home in their convenient place and time.