Learn Japanese for free at the Tower of Babelfish. I talk about a method I developed to learn languages to C1 fluency in 4-5 months. I just finished the Japanese section and talk about how to use this method for Japanese
Learn Japanese for free at my favorite bookmarked website, Jappleng University. No registration is required unless you want to take part of the community (it helps to study with others!). I love it, and it's brand new too!