Sure, the concept of Infinity is usually hard to grasp for a lot of people, but I will try my best to explain. Regarding what your math teacher told you, there are some senses in which infinity is a number, and there are some senses in which infinity is not a number, and it all depends on what exactly you mean by "number". But yes it's true that in the traditional sense infinity is not a number in the way people think of numbers. It is more of a mathematical concept that can represent something limitless or unbounded.

As for the statement "infinity + infinity = infinity". It is important to realize that when we add or substract infinite values, the result is still infinite. This is because infinity represents an unbounded quantity, so when you add or substract from it any quantity, the result will remain unbounded.
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