A valuable sentence to learn.
Also, "Aku suka kue ini banyak." Also useful.
when do you say "bukan suka" and when "tidak suka"?
We don't say "bukan suka".
Saya kurang suka kue ini. It is often considered rude to just say "I don't like....type of food". It's better and more polite to say that you less like it.