If you still don't understand, let me explain it to you

If Bitcoin costs $50,000 a piece and you spend $50,000 to buy a Bitcoin, this is an ordinary transaction.
But there is another concept that is leveraged trading. You still buy one bitcoin, this time you only need to pay 10%, $5,000, and I will pay the remaining 90% for you, which is called 10x leverage.
Of course, the 45,000 I gave for you was not given for free, it was lent to you, and you must pay me back later.
If Bitcoin rises to 55,000, it is up by 10%, you sell it, and you will make a net profit of 10,000 after paying me back 45,000. In other words, it is equivalent to doubling your 5,000 principal.
Of course, if Bitcoin falls, to 45,000, there will be a problem, and the remaining value will only be enough to repay the money I borrowed from you. So although it only fell by 10%, under ten times leverage, your own 5000 is equivalent to losing all your money.
At this time, you say that you are sure that the price will rise back, and you don't sell, hold on, okay? Definitely not. You can hold on to your own money, I borrow your money, that's my money, why stand up with you, in case you can't get it back, what will you pay me back? So I have the right to sell the coins for you, and then take my 45,000 directly. Even if the sale is slow and the bitcoin falls to 44,000, then if you sell the bitcoin, not only will you lose all your money, but you will also owe me 1,000. The 1000 is a debt, which you have to repay, which is called liquidation.
At this time, if you don't want to liquidate your position, you have only one choice, which is to cover your position. For example, if you add another 5,000 to your account, so that your cash plus bitcoin is worth more than 45,000, I am relieved.
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