I am stupid, and cannot understand all of this. Here's the definition that I have for gerund:
A word that ends in '-ing' which is made from a verb, and that is used like a noun.
I do not understand this either, but at least I have understood it in the past. Grammar is a strange and confusing beast.

If this is wrong, confusing, misleading, or just plain redundant, let me know and I will get rid of it.