This is the 1648th most frequent Russian word.
какие
"Какие" means "which" or "what" (plural).
The word 'какие' is used here as an interrogative pronoun to ask about the specific qualities or types of books.
Какие книги ты любишь читать?
What books do you like to read?
In this sentence, 'какие' is used to refer to a specific subset of tasks that the listener enjoys, functioning as a relative pronoun.
Я знаю, какие задачи тебе нравятся.
I know which tasks you like.
Here, 'какие' serves to emphasize and exclaim about the interesting nature of the views, demonstrating its use in exclamatory sentences.