How does one know which altcoins come out recently and thus are trading pretty good? You can check coinmarketcap to see which coin has increased in price or decreased in price the most in last 24 hours or 7 days or month etc. But besides that, are there sites that show what coins will be released soon to the public? Thus by that i mean being able to buy from exchange like binance etc.
I get updates about new coins released in the market and doing well from social media crypto channels or pages. I observed newly released coins in exchange tend to do well at first and its value drastically goes down once stable in the market. So it's important to get first-hand news first. Coinmarketcap normally lists coins only when a coin only when it has been stabilized in the market.