Here are some guides I've written. Most of them are guides on using specific tools.
Anki is a flashcard program that allows you to create, study, and review flashcards.
asbplayer is an in-browser video player that allows you to watch videos with Japanese subtitles and sentence mine.
MPV is an incredibly powerful media player. Learn how to extend it with scripts to make it suitable for fast and efficient mining.
Log immersion, get experience points, level up, and share your immersion progress with friends.
Yomichan is a browser extension that allows you to quickly look up Japanese words while reading text on a web page.