What tools/methods have you found the most helpful?

Hallo und willkommen zu meiner Frage!

Title says it all, I've been taking my Deutsch seriously for just under a year and have found some good tools that I find helpful for learning, I'm sure everyone will have encountered these before but hey — we're a new community and it's good to get discussions started.

A book that I'm going through at the minute is called: German Grammar Drills by Ed Swick — recommended by elyssespeaks auf YouTube.

I've been using LingQ for a few weeks now and I think it's such a simple yet useful tool for boosting vocabulary, it makes it enjoyable to read in another language.

Anymore for anymore, currently I'm trying to escape being on three different language apps (looking at you Duolingo, Memrise, Speakly).