@ives @jssfr @FediTips I’m assuming your question is in good faith, so here’s a wiki link which gives a high level answer to your question
https://en.wikipedia.org/wiki/Electoral_system_of_Germany

Germans elect their members of parliament with two votes. The first vote is for a direct candidate, who is required to receive a plurality vote in their electoral district. The second vote is used to elect a party list in each state as established by its respective party caucus.