May I ask why major currencies tend to rise and fall together? For example, if I buy currency #BTC which is rising and buy currency #ETH which is falling, I will have one winning trade and one losing trade. How can I make the profit and loss equal? For example, if I put 20 USD into each trade, what leverage should I use so that the profit and loss are equal, considering one currency has a value of up to 8x k USD and the other is only about 1k USD? I don't know, so I'm hoping everyone can provide guidance.