What’s the difference between to, too, and two? It’s not too difficult to use them, once you take the time to learn what they mean – and do some practicing, too.
To has two functions. First, as a preposition, in which case it always precedes a noun.
Secondly, to indicates an infinitive when it precedes a verb.
Too also has two uses. First, as a synonym for "also":
Secondly, too means excessively when it precedes an adjective or adverb.
Two is a number.
The Bottom Line
The confusion between to, too, and two occurs because the three words are pronounced identically. If you’re able to replace the word with "also" or "excessively/too much," use too. If the word is a number, use two. Otherwise, you’ll want to use to.