My Kindle became my language tutor with these free add‑ons
www.makeuseof.com/kindle-language-tutor-free-addons/
1 Use the built-in dictionary, Wikipedia, and translation tools – A tap is all it takes to learn a new word
2 Reinforce vocabulary with the Vocabulary Builder – Every lookup becomes a flashcard for later
3 Import and read foreign-language ebooks – Exploit free language resources
4 Export highlights for practice – Build your own phrasebook as you read
5 Pair Kindle books with Audible – Read and listen at the same time to double your progress
6 Use text-to-speech for pronunciation practice – Let your Kindle or phone read aloud in your target language
7 Read bilingual or parallel text books – Compare languages side by side for a deeper understanding
8 Organize your Kindle library by level or theme – Track your progress as you advance