To be honest, I just ignore them and focus more on the real thing that would really change the world, which is Bitcoin. Stay away from scam coins which is called shitcoins. But of course, there are some good altcoins to consider because they help Bitcoin grow, for example advertisement or something. Take note, altcoins do have some good effects on Bitcoin. For me, altcoins kind of help reduces transaction fees from exchange to exchange or exchange to a wallet.