Steemit is talked about by many as a blogging platform therefore users will blog about a variety of topics. The best way to curate what you see now and in the future is to Mute what you don't want to see and Upvote for what you like. Then there is the Flag for bad stuff :)

As in many cases the community will decide. If posts of cats and smoothies receive activity and generate rewards for the poster... there will be more of it.

If most people ignore a topic we will see less of it