What books/movies/shows/comics would natives speakers recommend?
Probably getting ahead of myself since I am just beginning but what extra resources are good to help us work on fluency?
Golwg360 is on-line. So is Ciwb. Y Cymro is a printed magazine as is Lingo and IAW! :)
S4C on-line is also good :)
S4C is also available on telly in the rest of the UK and Ireland if you have Sky (channel 134), Virgin Media (166) or Freesat (120). Sadly not on Freeview outside Wales.
The two best, best resources for self-learning, apart from Duolingo itself, for visual learners, are the series of videos on pronunciation on youtube:- https://www.youtube.com/user/welshplus
and the Big Welsh Challenge course :- http://www.bbc.co.uk/wales/learnwelsh/bigwelshchallenge/ (click on 'enter course', then 'skip introduction'), the section 'practice with tutor' is particularly useful, especially the male South Wales presenter, who is a well know, very funny Welsh actor.
For auditory learners 'Say something in Welsh' is very good and has a wide network of supporters in particular its popular facebook group. https://www.saysomethingin.com/welsh/course1