I'm not a teacher so I won't teach these to anyone, but if you're looking for a sense of how often they are used, 1 and 2 relate to businesses. If you are teaching business English, they would be useful.
If you are teaching how to write or enjoy reading crime fiction, then 4 makes sense to learn. Otherwise, it's just not that common.
I've never used 3. We talk about seeing things in black and white to mean being a person of absolutes -- all this, or all that, but nothing in between.
On the other hand, 5 is pretty common.
Student or Learner