Here are some great YouTube videos from trainer Zak George as well. Some are geared towards puppies but they are also relevant to adult dogs.
How to Potty Train & Crate Train a Puppy OR Dog HUMANELY and EFFECTIVELY: https://www.youtube.com/watch?v=FG-gyJP8op0 Potty Training: How to Train your Dog to RING A BELL to be Let Outside: https://www.youtube.com/watch?v=wCN7qWmjLkc The 5 Most Common Potty Training Mistake: https://www.youtube.com/watch?v=FQpsakJonsU