The sum of two points does not mean anything, geometrically. You can mechanically form the sum of two column vectors that represent points, but the result is meaningless.
You have reached the end of this chapter. Perhaps you would like to see if you remember any of it:
The next chapter will further discuss operations on vectors. The chapter after that will discuss further operations on vectors. The chapter after that will further discuss further operations on vectors. It is going to be a long semester.