Learned German. A little Duolingo, then

* memorizing vocabulary and practicing pronunciation with Anki

* private lessons

* grammar book with exercises

* podcasts

* news

* some books.

Worked very well. Had a good starting point when I arrived in Germany, and the immersion then helped a lot (but I stopped using Anki due to laziness). I found this page very useful: https://puroh.it/learning-german-a1-to-c2/