Learning Japanese phonology from a written resource will always be a losing battle. It's alright for getting the most basic understanding of what the mora kind

Learning Japanese phonology from a written resource will always be a losing battle. It's alright for getting the most basic understanding of what the mora kind of sounds like, but one must practice with audio resources to improve their phonology. Pimsleur and Dōgen (on Patreon) are great for this. It's super uncommon that you find written JP resources that go in depth about e.g. the vowel devoicing rules, or how っ works.