I find one of the fundamental ones is pain. It's not an emotion, but it's not that easy to classify what is actually painful and what isn't. Holding a phone in my hand isn't painful, but at some point I managed to do it so much that it did become painful. I don't know how to describe the pain, but I know that I am apprehensive of holding a phone in my hand for extended periods of time.
Another one is stress. People might not know they are stressed, but they are. They just can't recognize what stress is.
What I'm getting at is that a lot of things aren't taught explicitly. We don't even know how to teach some of that, because we don't have a good classification system for the feeling/emotion.