I think you are talking warrants from your post. You can buy and sell any time if it is american or european does not matter. The option of converting to ordinary shares is what is relevant when you want to convert to the ordinary (underlying) share. Here American and European have their own rules. Buy if you merely want to tarde them (buy and sell at any time) it does not matter what one you use. What does matter is do you understand gearing and spreads etc. If not I suggest you stay away until you learn more about it and do paper trading (buy on paper what you wanted to and track it to sell. Do this at least 50 times before placing actual money on it. DO NOT CHEAT YOURSELF ON PAPER, YOU ONLY CHEATING YOURSELF, AND YOU BANK ACCOUNT, IN THE END) that way you dont loose money and you are guaranteed to loose money if you dont understand the product correctly. SSF and CFD etc same thing.