I mainly earn from affiliate marketing online and providing services that i have obtained thorugh my sites.
I always see here at DP cpa and earning affiliate commissions is the easiest and reliable earner if you keep to whitehat methods or risk blackhat for quick cash........ Just about every second money making guide here is cpa related but its harder for people from certain countries to do this Otherwise u need to sell and market your own product or service and hope it not already overly competitive and at the right price for buyers - fourms are ideal for this approach
Foreign Exchange for me and Blogging also..But I would say that Blogging is a very good foundation of money making