My book says that "koto" can convert verbs into nouns. It can also convert adjectives and adverbial nouns, but what does that mean? It gives examples like:
Tori o tsukamaeru koto wa kantan ja nai?
Watashi wa kare ga nihon e itta koto o nd dare date boku ga atama ga warui koto ot shitteru
The book says "koto" means "thing", "fact", or "matter".
How exactly do you use "koto"?