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I have an extra 1000€ per month, what should I do with it?
1: Low fees means: a Total Expense Ratio of less than 0,5%. One detail you may also want to pay attention to whether the fund reinvests returns (Thesaurierender Fonds) which is basically good for investing, but if it's also a foreign-based fund then taxes get complicated, see http://www.finanztip.de/indexfonds-etf/thesaurierende-fonds/