ETH is hot right now, but following new coins is important too. Coingecko has a good trends chart to check out, but also follow the discussions on Reddit to see what is likely to spike.
They were the bomb a few years ago, when it was like a PTC for BTC, but not so much now with the explosion in crypto, as you can earn much more with a good strategy, like turning $100 into $78000 :)