I am from the UK and I am new to trading crypto currencies as have a question that will clear up ALOT of things for me. I want to operate on poloniex and I heard it is one of the best exchanges. What I have gathered so far is that to make money by trading bitcoins and altcoins short-term, I would need to buy bitcoins from a marketplace such a localbitcoins (only decent one ive heard about), deposit them on the poloniex and trade them between the other currencies and then once satisfied withdraw and sell them on a marketplace? I am very new but SUPER interested. If there are any other ways or I am just simply missing the point please let me know, i want to do this the most efficient and effective way.