Don't be misunderstood that hedging means going long and short in the same market. That's just bollox and you end up spending twice the comms. Your broker will love you for trading this way.
A true hedge would be a similar market or/and sector. Say for example you are long in one bank stock, you could be short in another banking stock. Therefore as one (assumed over bought) stock is short and the other (assumed oversold) stock is long. Both being in the same sector protects the trade with respect that we will not run out of banks - plus they are too big to fail etc. As one fails, others gain strength/customers. Therefore your trade is hedged in that sector.
Hedging does not have to be the same sector. Another example is gold V's dollar.
NOTE: Hedging is not guaranteed for profits, it just helps to limit losses if you trade in a particular sector or running a large book.
Lee