You're right this dithread and ask about how Bitcoin trading.
First you have to have a Bitcoin or altcoin to be traded
Second, you can do when trading is to buy at low prices and selling when the price is high.
Third, if you're trading on altcoin then you should know first coin anywhere potential for trade.
Trading is very simple, you just do purchase it, it is a technique that is difficult to analyze how the movement of the price! Use good money management and start trading with small money