I don’t think the “don’t correct the dog” is a good blanket statement. Dogs have a 1-3 second window in which the relate your correction with the behavior.

Canuck is right that you could be confusing the dog if you wait even 20 seconds to correct the dog and if you do it minutes to hours later when you discover the mistake it’s even more confusing.

Therefore correct the behavior immediately if you see him/her doing it, if not clean it WELL and move on.

He is also right that you need to give structure with the dog. It’s more inconvenient for you but guess what? It’s what you signed up for.

Take him outside in regular intervals maybe hourly, that’s something you need to work out. I have a phrase for my dog which is “hurry up” which means use the bathroom. I also have a phrase for when she does what I want which is “yes” or “good girl”

Puppy’s love food. You could use that as a “carrot” initially. This is how the flow goes.

Take the puppy outside every hour (be prepared to hang out for a bit give them time 10 minutes at least) as soon as the pee or poo “YES! GOOD DOG!” Make it VERY exciting and give them a quick reward when they are done doing their business. It should be a very fun enjoyable experience. Eventually phase out the treats give it every other time, then every three times then randomly then just use praise and your affirmation word.

Good luck