16 Lessons of the German Language. Polyglot

This is a series of self-teaching books by the famous polyglot and simultaneous interpreter Dmitry Petrov. He believes that to speak a foreign language, it is not necessary to dedicate decades to its study. It is much more important to master the basic algorithms, plus - the minimum necessary vocabulary for communication.
And all of this is quite possible to achieve in 16 lessons, which Dmitry Petrov has demonstrated many times in his TV show on the "Culture" channel.