To vs. Too: Two O's Mean "Also" or "Excessive"

To is the most common, preposition ("go to school") or infinitive marker ("to write").

Too means "also" ("I want to go too") or "excessively" ("too hot").

Memory trick: too has an extra o, meaning extra, excessive, or also (one more).

"Two" is the number. Three homophones, three different jobs.