And yes, there are other forms of learning too, but before you decide you can't focus (on a book, podcast, learning a language, a complicated movement, etc.) make sure you have a specific strategy for each repetition or attempt, page or chapter. Focus emerges from having a deliberate strategy.

Obviously, there are instances of passive learning, but there's always an underlying strategy and rule even to those. Sometimes it's made aware to you; sometimes it's not.