Girls ? moms ♥️ when did you meet with potty training and how did you do it?

Girls ? moms ♥️ when did you meet with potty training and how did you do it? Yesterday I learned that a friend's daughter is 3 years old, but she still wears diapers, I think this is not normal. Mom says she learned to sit, you need to teach her to pee a little bit, to sit down