My colleague is really interested in the Navajo and their language. He is tying to learn the language for some time now and has done all the courses he could find on the internet, only those were only beginners courses.
Does anyone happen to have any advice on how to move on from there? The beginners courses only cover some basic words, numbers and sentences. He would like to know how the grammar works and of course new words and sentences.
Any advice/tips on how to become more intermediate/advanced in using the Navajo language would be greatly appreciated! Thanks in advance!