Poloniex is certainly not for beginners. You need to already have cryptocurrency to start trading on Poloniex. However Poloniex is a industry leader in altcoin trading, many coins not available on major exchanges can be traded on Poloniex. Poloniex very often is DDOS’ed during peak trading hours, and customer support is not very responsive. It is only advised for experienced traders who don’t mind slow performance of the platform and customer support.