These courses were developed for Peace Corps volunteers going to serve in local communities around the world. They provide written and audio lessons to convey the basics of a language as a volunteer might encounter.
The courses are basic and can be used as a rough guide or background to a language. There is no advanced grammar or vocabulary so they are suitable for beginners. You can listen to the audio lessons and follow along with the text. You will not master a language with these courses but hopefully you find them useful!