I have read and heard that one can earn and make good money with trading bitcoins.I also want to give it a shot.Everyone says the basic rule of trading is buy low and sell high but I am confused because which ever exchange I try,the buy rate is always higher than sell rate.How can one profit if sell rate is less than buy rate.If I buy at $390, the sell rate is $380
Despite what you have heard, most traders lose money, especially the inexperienced ones.
"Buy low, sell high" is not a rule or a method. It is a requirement. If you can successfully buy low and sell high, you will have a profit. Otherwise, you will have a loss.
Here are some more helpful "rules" in the trading world:
"There ain't no such thing as a free lunch".
"If you've been playing poker for half an hour and you still don't know who the patsy is, you're the patsy."