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Learn family vocabulary, how to describe people, and how possessive adjectives work in Italian.
Adjectives describing appearance and personality must agree with the gender and number of the person, e.g. alto (tall, masculine) becomes alta (feminine) and alti/alte in the plural. Other useful adjectives: basso/a (short), simpatico/a (nice), divertente (fun — same for both genders).
Possessive adjectives (my, your, his/her) agree with the noun they describe — the thing that is owned — not with the owner. For example: mio fratello (my brother, masculine) but mia sorella (my sister, feminine). In the plural: i miei fratelli (my brothers), le mie sorelle (my sisters). Notice that most possessives (except loro) also take the definite article before them, except with singular family members: mia madre (no article), but la mia famiglia (article needed).
Unlike English, suo/sua/suoi/sue can mean both "his" and "her" — the ending agrees with the object owned, not the owner's gender. Il suo cane could mean "his dog" or "her dog" depending on context.