Where did everyone start for potty training and when did you know he/she was ready? If you have yet?

Tamara • Mommy to my 2 beautiful baby boys, Nathan Louis💙 born August 12, 2017 and Parker Joseph May 6, 2019❤️ My whole world😍

My son knows what the potty is..his potty is in the bathroom so whenever I have to go he comes and he says potty and sits on his potty. He can’t pull down his pants all the way yet, but pulls them down halfway.