"CSV FILE" is just a text file or flat file, with information within separated by the "comma" character (,)
i.e. if you want a file with symbol, operation, stoploss, takeprofit, then it would look like ...
XAUUSD, BUY, 1200, 1500
XAUUSD, BUY, 1400, 1600
XAUUSD, SELL, 2000, 1600
Microsoft Excel for instance would enable you quickly to save your spreadsheet with such columns in the CSV format.
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