To conjugate or use an -are verb, first you remove the letters -are from the infinitive, which leaves you with the stem:
infinitive: parlare (to talk)
stem: parl-
To the stem, add the ending -o, -i, -a, -iamo, -ate, or -ano according to the subject.
English also has a different verb ending depending on the subject ("I eat", "you eat", "he / she / it eats"...) but you must state the subject. In Italian, the subject pronouns are redundant, so they often are omitted.
Example: