I see you are a NewBie asking this question, therefore I am not surprised. Well there are many popular AltCoins. Eth on top of it. I work for a cryptocurrency exchange Coinswitch.co and we have like 300+ coins traded on us. Therefore I can for sure comment on the no. of coins which are been traded in general.
Now say today 27th June 2019, the scenario of the market is there is a blood bath in AltCoins. All the funds which are in alts are moving to bitcoin as the traders say. Reason is BTC is pumping and always safer to support the rising sun. Alts mostly out of the top 10 - 20 lists are just for pump and dump. Still there are many popular AltCoins -
- BNB - Yes the new Ethereum in making, Binance Chain, IEOs, and the greatest marketer ever CZ. BNB in reality has no primary use case, even if you remove BNB out of the Binance eco system, the exchange would still be functional, but it exists to have a brand name established.
- ETH - My favourite of all alts, smart contracts, Vitalik, Hackathons, Community, dapps, and now loan on ethereum blockchain, things are moving fast here, and adaption is at light speed.
- BAT, XRP, LiteCoin etc.