first off the words to, too, and two are homophones: they sound alike but have different meanings.
The preposition to refers to a place, direction, or position. To is also used before the verb in an infinitive.
The adverb too means "also" or "excessively."
Two refers to the number 2.
Meg was too tired to walk home. I was tired, too. The two of us walked to a phone booth, and I called for a cab.
"Ferris, please. You've gone too far. We're going to get busted."
(Mia Sara as Sloane in Ferris Bueller's Day Off, 1986)
For: for the love of god what are you doing
this is for you
I got this for you
we are going out for a movie
we are going out for food
we are going out for dinner tonight
if not for her I would have been lost.
not sure if this answers your question, but you are asking about two of the most common words in the english language.