Books to download:
Kurdî for Beginners – Good book, but it contains a lot of soranî vocabulary.
Hinker 1 – First book of the Hinker series (3 in total), great for exercises, but it does not contain any explanations.
Dersa Kurdî – Series of 60 videos in Kurmacî. . Other more difficult videos in the channel.
Learn Kurmanji – Has several lessons with videos, audios and explanations. Great for beginners