There are many ways of earning money online. Some are safe but slow, some are risky but high. But in any way, you will need to work for it.
For those who like safe and slow the easiest way is PTC, check it out for more details. For those who are willing to risk but need profit fast, HYIP is the fastest way. There is also MLM. At MLM you need to work harder because you won't achieve anything if you don't promote and bring affiliates to your business.