Learn French: Tu as une grande télévision chez toi. - You have a large television at your place.

As is the specific form of the verb avoir (to have) that goes with tu (you, informal). If you were talking about yourself, you would use ai (j'ai = I have), and for he or she, you would use a (il/elle a = he/she has).

Why does grande come before télévision? Don't French adjectives usually go after the noun?

Yes, most adjectives go after the noun in French. However, short, common adjectives that describe Beauty, Age, Goodness, and Size are exceptions and go before the noun. Since grande describes size, it comes right before télévision.

What exactly does the word chez mean?

Chez is a very handy French word that means "at the home of" or "at the place of." So, chez toi means "at your place" or "at your house."

Why do we say chez toi instead of chez tu?

After prepositions like chez (at the place of), avec (with), or pour (for), French uses a special set of pronouns called "stress pronouns." The stress pronoun for "you" is toi. Tu is only used when it is the subject doing the action (like at the start of this sentence: Tu as).