What exactly is the difference between isolated and cross margin?
In isolated margin mode, each position uses only the margin allocated to it. If it gets liquidated, you can lose at most that amount of margin.
In cross margin mode, a large unrealized loss on one position can eat into the shared balance of other positions, weakening the safety buffer for all cross-margin positions.
Add the price at the end: $BTC is quoted at 82793.76 (24h -0.065%).

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