Books to download:
Kurmanji_Kurdish_For_The_Beginners – Good book, but it contains a lot of soranî vocabulary.
Hinker 1 – First book of the Hinker series, great for exercises (but it does not contain any explanations in english)
hinker_2_Layout 1 – Second book of Hinker
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