There are many times when I read something with the wrong form of to, two and too. That being said I want to discuss the differences.
To is a preposition demonstrating relationship between two things. I drive to the movies. He gave the cupcake to his mother.
Two is a number. There are two cats on my couch.
Too is a synonym for also. I love him too. It is also a word indicating excessiveness. There are too many people in the crowd.