Comment by xrd
When I lived in Japan my method of study was to write down all the kanji I didn't know. I don't really think you can learn a language like Japanese without writing it down. There is something magical about writing that locks information into your brain in a way very different from just reading it on a smart phone.
Full disclosure: I'm making a site that allows you to read books and then practice kanji by hand and then save to flashcards for later review.
Example:
https://community.public.do/t/kokoro-by-natsume-soseki-parag...
Click on the "kanji" at the bottom to expand and show the kanji in the page. Click on a kanji to see the animated strokes and practice it right there by hand.