Let's start with homophones:

Your/You're-

Your: the possessive form of "you", generally used before a noun
EX.
Your eyes are a pretty color.
Your dog is cute.

You're: a conjunction of You & are, can be used in any situation where you would say "You are"
EX.
You're looking very pretty tonight.
You're a lovely young lady.

To/Too/Two-

To: used as a function word to indicate an action if some sort.
EX.
I had to go to the store today.
I needed to get some mascara

Too: excessively or also
EX....
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