Besides having separate Favourable Information, trading BTC contracts and trading ETH/SOL contracts are the same!

Let me give you an example. Suppose I open 1000UBTC, and at the same time I want to open 1000U in ETH or SOL. Actually, it's unnecessary; I might as well continue to directly increase my position by 1500U in BTC. Normally, the increase in ETH is 1.5 to 2 times that of BTC's fluctuations, so it’s better to invest all funds in one cryptocurrency. In special situations, it can be handled better this way. Moreover, the trend of BTC is generally easier to understand and grasp than that of ETH and SOL, so I recommend everyone to focus on BTC and allocate all funds to BTC positions. As for other altcoins besides the big three, you can trade them as you see fit. There’s really no need to open positions in the same direction for the big three when doing short-term intra-day trading unless there is specific favourable information. Of course, there will be cases where ETH/SOL rise or fall significantly, but BTC also often experiences significant fluctuations. Still, the point is that BTC allows us to better seize opportunities. This is my personal view, for reference only.
Above.