It is most times seen that whenever there is a drop in price of bitcoin, there is likewise. a drop in price of Alts as well. Which Alt is not usually affected?
The only coins not affected by the price of bitcoin are stable coins like tether and the like, and if you think about this it makes sense, almost all the coins are using the technology created by satoshi nakamoto with just some small changes, so it is natural that almost all the coins respond to bitcoin and when you add that most of the money is invested in bitcoin this explains why when the price of bitcoin moves alts move in the same direction.