One of the many advantages of a semester abroad with Erasmus+ is the funding you will receive. You will be exempted from the study fees and additionally will receive a monthly grant (Mobilitätszuschuss) to support you financially during your stay abroad.
The grant varies depending on the living costs in each country. See LMU's website Vorteile von Erasmus to check the amount of the grant for your destination.
An exceptional case is Switzerland: Here, the partner university pays for financial support. For more information see Sonderstatus Schweizer Hochschulen.