Herzy identified well what Se was all about, and untangled the crap and the quality.
Now, I'm not going to do the same, because I'm not adequate in socionics knowledge enough to do so. However, one thing I do know is that people are often very wrong about Fe in the following respect.
What people get wrong about Fe is the way in which it manifests itself.
When people see someone who is emotionally expressive or speaks enthusiastically, they automatically think Fe. This is bullshit.
Keep this in mind.