This. Considering that OP already lives in Germany, it's also the most practical option in the long run. No sitting in the classroom or paying for anything. Jus

This. Considering that OP already lives in Germany, it's also the most practical option in the long run. No sitting in the classroom or paying for anything. Just applied knowledge with an instant feedback loop -- folks either understand you, don't, or correct you (the best option). To kickstart it look up basic pronunciation, grammar, and some vocabulary (but don't get too hung up on it), from there on it's mostly exposure that counts.