To is a preposition, meaning that it's used with a noun or pronoun. Most people use it all the time.
To and too
e.g. "Kylie danced to the music".
To has a massive range of uses and meanings, too many to go into here!
[Ed. Did you see what we did there?]
Too has a number of meanings. As well:
e.g. "Gemma wanted to go on holiday too, but dogs weren't allowed on the plane."
e.g. "Vic had added too much flour to the cake mixture."
More (of something) than ideal:
e.g. "Mercury was too close to the Sun to be habitable."
These two words (to and too!) get muddled up all the time. Good luck to you too!