Brief background: I have been learning German for slightly over a year, concentrating on passive skills only. My main course materials have been courses on the Deutsche Welle website, Living Language Ultimate & Advanced German, and Aspekte (I only bought textbooks/workbooks/audio). I have a library of various German learning books collected over the years when I very briefly would entertain the idea of learning German, never persisting beyond a few pages. Anki has been my mainstay, and in the past year I have learned over 10,300 lemma forms (give or take 2-3% either way), and have another 4K words in the queue. Creating this Anki deck (sub-decks by courses and other sources of vocabulary), has been very time consuming, but worth it to me. My passive understanding is fairly good. I can understand NDR documentaries almost perfectly, easier Krimi TV series like Komissar Rex (dog theme fits polydog!) very well, and doapy soaps like Sturm der Liebe fairly well. The TV series Tatort has been harder, but is getting easier. I read online newspapers daily with a popup dictionary and don't have much problems unless it is very technical (some of my vocabulary sources are lists from courses I don't own but which like other German produced courses focus on CEFR levels and the business/technical vocabulary that often goes with same). u.s.w.