I understand that to be able to type en and em dashes I have to configure the COMPOSE key, or something like that, but I am not sure about that nor on how I get from there to be able to type en and em dashes in addition to the minus sign.
How do I type en and em dashes on Ubuntu GNOME 15.10 with GNOME 3.18?
I have now looked at this answer, so I would now also like to know the code for the en dash and how to assign other keyboard shortcuts to these Unicode characters, as I don't want to have to type something too long in order to get these.