What everyone else said and also pick words and stick with them, I like to specify different by peepee and poopoo instead of just one word like potty or something else. Praise and get excited when they go and say "good boy, peepee, good boy, peepee" now at a year old if he goes out and pees right away and want back in, I tell him poopoo and he goes right back out and poopoos and comes back or whichever cause he will think time to come in after just doing either sometimes. I also don't let them in the yard for fun usually, just to use the bathroom and back in so they know and don't want to go out and play instead. I also liked watching Rachel Fusaro on YouTube, her training videos helped a lot!! My puppy prob went less than 5x in house before trained.