Leverage
Quick definition
Borrowing money to trade a bigger position — it magnifies both gains and losses.
Leverage lets you control a position larger than your deposit; 10x leverage turns a 1% move into a 10% gain or loss. A move against you can wipe out your margin entirely (liquidation).
It's the fastest way beginners lose everything in crypto. Simple spot buying caps your loss at what you invested; leverage removes that safety. Not suitable for beginners.