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3am. Red portfolio. Liquidated. One tab open. I learned everything that night after watching my account vaporize because I didn't understand the difference between isolated and cross margin. When I started, I thought margin was just a tool to juice gains. I was wrong. It is a containment field, and if you pick the wrong setting, you are inviting total bankruptcy.

Imagine you have a $1,000 wallet. You want to long $BTC and short $PEPE simultaneously. If you use Cross Margin, your entire $1,000 balance acts as collateral for every open position. If $BTC rallies against your short and you get liquidated, the exchange pulls funds from your entire balance to keep the position alive until the account hits zero. You lose the...