Well, the main diferent is when in the grammar. My british's techer used to say that in American they don't use the all the tenses in the correct way and use present perfect for everything.

Bye!

Hi. erika1988 is right, but there's a little more to it than that. There's no shortcut way of learning it but if you're interested I can send you some exercises to help you recognise the differences and help you learn to understand both equally. Add me and we can take if from there