Reply To: Why can I delete but not disolve a cilinder cap?

Ok, I think I have it now a bit more clear. But still are cases that are hard to understand for me like this one:

I’m going to disolve these 2 edges at the bottom. I expect both 2 become 1. The edge at the middle separating both faces disappear (because the bottom middle vertex will be destroyed and in the end you get a new full ngon composed by the two faces.

And the result is:

 Perhaps I should stop trying to understand everything too much and just use it a lot until it clicks.

Answering to Omar: I was trying to remove the face using dissolve face :/. I understand now that for faces you need at least 2 selected to be able to dissolve.

Cheers!