I often see Korean learners making sentences without adding all of the markers - removing the topic marker or removing the subject marker. This is usually fine. After all, native Korean speakers themselves do this sort of thing all the time. However, just because native speakers can remove markers when speaking, that doesn't mean markers aren't necessary in speech. In fact, removing markers isn't as easy as it seems - removing them can also sound less natural. It's unfortunately not as simple as "it's okay to remove markers." And removing too many markers can even sound awkward, or at the least sound less like a native.
I talk about how native Korean speakers do this, and what things to consider when you want to do this. I also give some advice for how you can sound more natural while removing the topic and subject marker.