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.
This forum itself is a source for getting information about new coins. I do visit several exchanges and they too provide some insights to the promising coins. Good exchanges generally avoid shady coins. And lastly it's coinmarketcap where I get the prices and list of exchanges where's it's listed on.