Watch your investments in inter bank market. If some forex brokers claim to be engaged in such a market, be cautious and ask for full information.
Don't trade on margin. One should best service understand that one can lose amounts much larger than margin amounts that one pays. One should clearly understand margins, before committing.
Don't send or transfer cash on the internet as it can be lost for ever. It is highly unsafe. Many companies do not indicate their addresses or contact numbers on their websites. Avoid these companies.