Hey @newbie555, there is a few in these forums that know a great deal more about your question than I do. I believe it’s called a Carry Strategy and you basically make profit from the difference in the currencies Interest rates…
Each pair has a different swap rate, both negative and positive… ie: you can be in a losing trade but still get a positive return on the swap every 24 hours…
I have added a few articles (4) that may give you some more information on your question…
Any time you have to close a position for $720 loss is possibly not a sound strategy…
Hope this is of some help… Cheers