When did your toddler start talking?

I know some are purely late bloomers in the speech dept and also totally fine. My son has said some words, he occasionally tries copying us or Ms Rachel when he watches her. He says "oh no" all the time. I'm just watching a 21 month old who has like a full vocab haha (not really) but copies whatever he is told to. My son is a little bit more stubborn than that 😅