There is much to gain in online forex, but also much to lose. Any trader can gain much money with the online forex trading, but it is no so hard to lose money either.
It is very, very important to learn the forex market rules and laws before beginning to trade. It is very important that you understand any chart or statistic that you see in a forex site. It is vital to understand the whole picture before trading. Never risk your money because of laziness.
Learn to use the tools that online forex provides you with, before using them. Margin trading for instance can help you profit much more than your initial finance would have allowed, but also loose much more than you would have intended.
Always be on top of your forex trading. If you don't know what exactly a chart means, find out. The world of foreign exchange is a vast and complicated one. It is seemingly very hard to grasp at start but it is very important to learn all you can before trading.
Many online forex trading sites offer very useful tutorials. Read several of them and cross-reference all your forex information. Knowing the forex market means making more money online!