How do people lose money in Forex trading ? ( 10 points for best and serious answer )?

I want to know about Forex trading (just for my knowledge ) I do not understand how 95 % people lose money ? is there any given time that you can hold the currency ? or can you hold it for a long time(like 1 year ) (like stocks ) and sell it ? if some one starts with $10 ,what is the maximum that he can... show more I want to know about Forex trading (just for my knowledge )

I do not understand how 95 % people lose money ?

is there any given time that you can hold the currency ? or can you hold it for a long time(like 1 year ) (like stocks ) and sell it ?

if some one starts with $10 ,what is the maximum that he can earn from ONE DAY (assume that he is the best forex trader in the world) :P ?
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