"I have a plate."
Translation:Io ho un piatto.
Ho is the first person singular = I have. Ha is the third person singular = He/She/It has.
It's well-worth learning all the present tense conjugations of "Avere" because it is such a common verb, Ho, Hai, Ha, Abbiamo, Avete, Hanno by heart. That is: I have, you (singular) have, he/she/it has, we have, you (all) have, they have.