I have published 2 books for learning second language:
1:Learn Spanish with book: Discover Spanish
2:Learn Romanian with book: Discover Romanian
Learning Spanish or Romanian will open cultural horizons for you. You can download these books for Kindle but you can now order printed color copy of these books. Both books have inside color beautiful images to enjoy visual learning.
View Maj School book series:
https://www.amazon.com/dp/B0DRDHQGJQ?binding=kindle_edition&ref=dbs_dp_rwt_sb_pc_tkin