Tongan has so many unique concepts like Kai Pō (V.) - to eat something in secret because you don't want to share with others -.
You can learn Tongan online on italki.
Learn Tongan on italki
italki is one of the best language learning apps out there because it offers unique classes that you can't find anywhere else. Whether you're interested in brushing up on your French before your trip to Paris or learning Japanese to help with business negotiations, italki has a class for you. With great native teachers and a convenient online platform, italki makes learning a new language easy and fun.