To go short (or short selling) means you’re betting that the price of an asset will go down, not up. So instead of buying low and selling high, you’re doing the opposite: you sell high first, then aim to buy low later to profit from the drop.
CFDs are a super common way to short various assets without borrowing them. You could also buy put options or open a margin account to short stocks.
The big thing to remember with shorting is that losses are effectively uncapped because the price can keep rising.