To, Too and Two

Words that have the same pronunciation but different spellings and meanings are called homophones . Like 'to', 'too' and 'two'. All three words are pronounced the same way but there is nothing else that is common between them except the pronunciation.

TO

A preposition of movement or direction. It indicates the place you arrive at as a result of moving.
E. g.

I will take a taxi to the airport.

From X to Y, here 'To' refers to the end point of a time period.
E. g.

The office is open from 8. 30am to 6. 30pm.

It identifies the person or thing affected or receiving something.
E. g.

I gave a present to my friend Preeti.

Can be used to show a change of state, condition or quality.
E. g.

We waited for the traffic lights to change from red to green.

Can be used as the first part of an infinitive (To + Verb = Infinitive). Notice when two verbs are together, the second verb is in the infinitive form (except Modal verbs and To Be)
E. g.

Next year I want to spend six months in Europe.

TOO

It is used before an adjective or an adverb for reinforcement to mean 'very' or 'more than'.
E. g.

This dress is too big for me.

(too + adjective)

Can be used as an adverb to mean 'also' or 'in addition'
E. g.

She has been to Switzerland too.

(= also)

Too much and too many refer to an excessive amount of something.
E. g.

Too much

(+ uncountable noun)

Too many

(+ plural noun)

Sorry, I can't go. I have too much work to do.

There were too many people in the room.

TWO

Only used as a number. Two = 2
E. g.

There are two cars in the car park.

I can speak two languages, English and Spanish.

Since these words are so different in their meanings, they may sound similar but they can also be used in a single sentence altogether.
E. g.

It is too late to buy two bottles of water.

Don't be too late, we have to go out for lunch at two.