Everyone keep going around buy low and sell high. You guys are just using different and more complicated ways to say the same thing.
There are real techniques for trading. But, looks like no one here knows. And those who know it, are not willing to teach.
Yes, buy low and sell high. But it is more complicated than that.
First, wherever you buy, you are probably going to want to find a different source to sell.
For example, if you think you can buy on bitstamp and then resell on bitstamp, you won't have much of a markup if any. You have to find a different exchange or a different source to sell.
For example, buy on bitstamp and then sell on the otc market, like meeting someone in person or selling on localbitcoins. The difference in price of what you've bought and then what you've sold can be profitable.
Even better is if you find a trader who wants to get rid of his coins at below market rates. If you advertise enough on Craig's List, localbitcoins, backpages, etc, you may eventually find people, like miners, bitcoin enthusiasts, etc, who will see you at below market rate. You can then resell these on the exchanges or from a local buyer.
That is where the buy low, sell high comes in. If you can't buy at a good rate, you will not be able to sell at a higher rate.
Hope this helps!