convert phrase into noun
Turns any clause into a noun phrase, meaning 'the fact that' or 'that'.
You can put ということ after a whole sentence to make it act like a noun. This is useful when you want to say 'the fact that...' or 'that...' as a subject, object, or after particles like は, が, を, に. For example, instead of just saying 彼は来る (he comes), you can say 彼は来るということ (the fact that he comes) and then use that as a topic: 彼は来るということは知っている (I know the fact that he comes).