There are quite a few coins that actually move in sync with BTC, and for these coins, you just need to pay attention to BTC. Then there are some speculative coins, which completely depend on the whims of their promoters. The biggest problem with speculative coins is their extreme volatility, sometimes far exceeding their expected range; if the direction is wrong and the candlestick loses support, managing positions becomes very difficult. Sometimes a stop-loss is just a slight shake, and the position is gone, but if you don't stop-loss and let things develop, there is a risk of liquidation. The larger the market cap, the more dispersed the chips, and the lower the volatility. This type is undoubtedly safer, but it is greatly influenced by news. For coins with little history, try to maintain a sense of respect for their future volatility; if the volatility is too high, both long and short positions can be very risky. At any time, the safety of funds is far more important than making a profit.