Hey i am new here and i know how to invest in bitcoin and where ...? link me the websites... 
From what country are you from? You can use your local wallets or local exchange site. There are plenty of exchanges site where you can buy bitcoin or altcoins you can google it.
You are just started so i suggest to read more before you invest because you have to fully understand on how to do that properly. Since you are here in the forum you can read multiple threads for you to be more knowledgeable. You can trade in some exchanges like poloniex and bittrex.