I want to invest an altcoins but i dont konw how to predict if that altcoin will pump or dump. Can you give an advice on how to choose a best altcoin to invest.
It's normal, nobody knows pump & dump. If you want to get rich quick this is not for you.
If you really want to make "investment" you should make your investigation and readings as well. I suggest big marketcap coins, Ethereum, Litecoin etc.