To vs. Too
What to Know
To is most often used as a preposition to indicate movement, direction, or location ('Let's go to the bakery'). Too is an adverb that most often means “also” or “excessively” ('I want a cookie, too.' 'That cookie is too big to eat').
When to Use ‘to’
To is usually a preposition. It is used to indicate things such as movement toward a place, person, or thing,
They went to the park.
I’m going to lunch.
She turned her back to us.
The park is a mile to the east.
came to our aid
We drank to our health.
the last point in a series,
working from nine to five
a relation or similarity,
The new poem was inferior to her previous ones.
compared us to animals
the receiver of an action,
gave a sizeable donation to the charity
or to indicate that the following verb is an infinitive.
I don’t want to go.
When to Use ‘too’
Too is an adverb that means “also,”
I’d like to buy this book and that one too.
He ate too much.
She isn’t too happy with the result.
or “indeed, most certainly."
”He didn’t do it!” “He did too.”