Writers are often confused about whether to use "to" or "too" in different instances in their sentences. It's an age-old issue that many people struggle with, and this post intends to help clarify the difference.
To
The preposition form of "to" indicates direction, position, or result, while the adverb "to" indicates something moving toward a desired position.
Too
The adverb "too" means also, in addition to, or as well. An additional adverb definition of "too" means excessively or more than enough.
The most confusion arises when attempting to determine which version to use at the end of a sentence. Typically, when the word is used at the end of the sentence, it's used in lieu of "also" or "as well," which would be the "too" version. When describing an item as being in excess, such as "too large" or "too thick," this is also the "too" version. All other instances (with the exception of the use of the number two) require the use of the version "to."