How to learn spoken Tamil.
At present Duolingo doesn't have a course yet for learning Tamil, we have to wait until that happens as it is still in progress.
In the meantime, I have created mutiple courses in Memrise (Memrise is almost similar to Duolingo) with audio for avid learners who are interested in learning the spoken Tamil. Details and links for the course are given below.
Tamil Alphabets: https://www.memrise.com/course/1558607/tamil-alphabets/
Important Tamil vocabularies with Transliteration: https://www.memrise.com/course/1645572/spoken-tamil-for-absolute-beginners-with-trans/
Important Tamil vocabularies without Transliteration: https://www.memrise.com/course/1661373/spoken-tamil-for-absolute-beginnerstamil-version/
Note: I have also written a book on "Spoken Tamil for Absolute Beginners", It is a very useful and highly recommended book to learn spoken Tamil, especially for beginners. Kindle find the links for the book below.