Language immersion resources
1000 basic words in Japanese
furigana reader addons (haven't yet decided which I wanna use / add to uwusearch)
https://addons.mozilla.org/en-US/firefox/search/?q=Furigana
:O this might be cool:
https://addons.mozilla.org/en-US/firefox/addon/furikani/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search

Kana
Tofugu Kana Quiz

Kanji/vocab
Wanikani - first few levels are free but after that it's paid
https://kanji.garden/

Grammar
Guide to Japanese