Short / Short Selling
Selling a pair (that you don't own) to buy it back lower.
Shorting in forex is native - no borrow fee. Pay or receive swap based on rate differentials. Short EURUSD = selling euros, buying dollars, profiting if EURUSD falls.
Learn to actually use Short / Short Selling.
Definitions are the easy part. The free first five modules put this on a real chart and make you do the work. No card required.