The Administration and Staff of SeN never guaranteed "Tutorials for everything". We only say that we have the most extensive Tutorials Database regarding Starcraft Mapmaking.
If a user says something like that, don't believe it until we say so.
The problem with EUD is that it is fairly new and only a handfull of people know how to use it and even they, can't fully explain it. Another problem is that it's insane to make a concept with these triggers. If you remember Legacy's ammo system, Mr.MooCow(U) spent hours, during a period of many days to find what hex is the one that counts attacks.