what is the meaning of sculping and what is the best method of trading forex?

Scalping is characterized by shortest periods of trades. You start as you notice signals of a new trend. You exit immediately when you see that the trend will is coming to its reversal. When you scalp, your profit will not prbably be very high, however, you are also prevented from deep losses.
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Think, Feel, Trade

As your first question already have been answered, let me elaborate on the second one. There's no best method nor best way of trading Forex. You can trade short term or long term, you can trade manually or with robots. It just depends on what suits you the most.

When choosing scalping as a strategy make sure your broker allows it.
ACM is one of the few that has no problem with scalpers; they are a Swiss broker about to become a Swiss bank.
Be aware that US brokers don’t allowed scalping, NFA doesn’t