Going long means buying bullish. For example, if you buy USDCHF, the current price is 1.0 1 10. If you do more, it will rise to 1.0 15. Now you make money because it's a little bad.

Shorting is just the opposite. If you think it will fall, short it.

Stop loss is to stop loss in time for fear of misjudgment. The stop loss point is generally around 2%-3%, depending on the individual.

Closing a position is similar to closing a position. If you feel that the profit is enough, you can close your position. For example, if you buy a stock, make a profit and sell it is a principle.

Hedging refers to shorting while doing more, and only losing commission when closing the position.