You should read this:
https://book.mql4.com/
You will find spreads from the broker you open an account with.  Scalping is also dependant on the broker.
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How can I get the minimum spread of trading points of each trade sever at the terminal of MetaTrader?
And the scalp method is forbidden by some trade servers. How can I know?
I wonder how the traders judge the scalp method.
I am not familiar with computer programming and can anyone give me a net page spreadsheet on the information of it?
Can any one with kindness help me?