"He reads you a menu."
Translation:Él te lee un menú.
Spanish has three groups of object pronouns: prepositional, indirect object, and direct object. Prepositional pronouns are identical to subject pronouns except for I and You (mí y ti). "A ti" is a prepositional phrase so "ti" is used here.
Also, the reason for having both "te" and "a ti" is for emphasis.
To say "you" we have to forms "Tú" y "usted" in singular and "vosotros" y ustedes" in plural.
Tu and vosotros are the colloquial form and Usted, and Ustedes is the formal or respectful form. Both are the second person, but when we are using the formal one we use the conjugation of third person in the verb and all the pronoums of third person (le instead of te...), so.
Tú lees, Usted lee
Vosotros leéis, Ustedes leen
Yo te leo (a ti), Yo le leo (a usted)
Yo le leo (a él/ella)
Yo os leo (a vosotros), Yo les leo (a ustedes)
Yo les leo (a ellos/ellas)
To elaborate: "me" is the IO first person singular pronoun, "te" is the IO second person singular pronoun, and "nos" is the IO first person plural pronoun. Spanish third person singular IOs use "le" to translate "he, she, or it" when any of these is being used as an English indirect object, and Spanish third person plural IOs use "les" to translate the English IO "them," with "les" being used for both masculine and feminine gender.