Day trading taxes in Germany

I live in Germany but I speak only english and its really hard to find some informations in english. Can someone explain to me like I’m 5 years old how taxes work.

Lets say for example I do 2 trades in one day. On first trade I lose 50 euro , on the second trade I make a 50 euro profit. Do I really have to pay taxes on the 50 euro profit one ? Or it canceles each other and you pay taxes at the end of the year for your total profits?