Some coins and altcoins are mostly correlated to king bitcoin, thats the no 1 reason. If king bitcoin going down/ or bearish, expect that other coins and altcoins will going down also vice versa if btc will goin up/ or bullish, other coins and altcoins will up also, they will follow the leader😎..

That's my tip also for those who are in trading, use correlated method👍👌

Remember,  if king bitcoin's price 1% changed (either up/down), 2-3% for those correlated coins' and altcoins' price. 💯👍