You can easily check the btc price movement and compare it with other top alts, if you view for example the crypto prices in coindesk. You can see the overview of the trend movement, and you will say a lot of these alts are indeed following the movement of bitcoin. But for small cap coins and unfamiliar projects, don't expect that it will follow the btc performance as some of them has their own movement especially if the team is playing the pump and dump game.