I think forex trading is a big business and here we come to make a profit and we get success. But in forex trading we have felt greedy, emotions and some other bad habits that give us losses. So I use a lot of large size for my account is 0.50 and I get profit in starting but in the end I get a loss. and that is because according to the money management I do with the use of lot size in the forex market depends on the size of the account the size of the small account must be traded with a small lot size while the opposite is the cause for large account size but still do what you do and you will find yourself You are very successful before you realize what has happened so we can determine our lot size according to money management rules