A Word You May Have No Need Of

Another word you usually don’t need is of. I spend almost as much time taking out of as I do that. You can take of out of all the sentences [not “all of the sentences”] below:

I knew all of the people at the party.
All of the answers flew out of my head.
I know of some things we can do.
We went outside of the house.
I want to see you all of the time.

You want to keep of in places where you mean “pertaining”:
He spoke highly of his friend John.

Or when using the phrase “outside of”:
Outside of [with the exception of] a dog, a book is man’s best friend.