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You've commented on one of the nouns that can be both genders, so to answer your latter question "Y dafarn" and "Y tafarn" are both equally correct. This isn't true for all nouns i.e "The temple" is "Y deml" because "Teml" is a feminine noun, and therefore "Y teml" would be wrong.
As mizinamo says, this only happens to feminine nouns after the definite article. This is called the soft mutation, and it's not just "t" which changes:
- b -> f
- c -> g
- d -> dd
- g -> -
- ll -> l
- m -> f
- p -> b
- rh -> r
- t -> d
(As mizinamo and ibisc pointed out, ll and rh don't mutate after the definite article, alongside a couple of other words.)
As we explain in the initial course notes, the course does not include slang terms, dialect terms (unless very common) or formal language patterns on this course. It is designed for beginners following the Dysgu Cymraeg courses for adults sponsored by the Welsh Government.