This is the same as "short sale". haven't you heard of this? is a trading strategy in which a trader sells an asset that he does not actually own, with the intention of buying it back in the future at a lower price. But for this you will need a trusted broker. However, you need a good broker in any case :) You can read about GO Markets https://tradersunion.com/brokers/forex/view/go-markets/. As for your other question, pay special attention to closing the position.
This is the same as "short sale". haven't you heard of this? is a trading strategy in which a trader sells an asset that he does not actually own, with the intention of buying it back in the future at a lower price. But for this you will need a trusted broker. However, you need a good broker in any case :) You can read about GO Markets https://tradersunion.com/brokers/forex/view/go-markets/. As for your other question, pay special attention to closing the position.