"I have introduced a sit / stay, where i cross the road first and then call him and Hendrix runs across the street to meet me. Yesterday was a breakthrough, we were able to do this crossing 6 busy streets with 4 lanes and a median."
All on leash, I hope? Reason I am asking, I once had a neighbor, that perfected the off-leash heel and sit stay on a busy intersection. His dog got killed by car going about 30 mph (the car, not dog), right in front of his eyes.
In regards to other commands, the list is endless, I add on throughout the life of my dogs, they are lifelong learners
whoa, heel, recall, down are the important ones and potentially lifesaving in a bad situation. back, side, front, move, place, off, fetch, leave it, out/give, wait, go, kennel, hustle, are the ones we use every day. Then words - each toy has a name: kong, red, yellow, orbee, crispy, etc...tricks: high five, stretch, etc.
You can teach verbal commands, whistle commands, hand signals. I once had a dog that was trilingual - English, German and sign language
Bev is right, you may enjoy an obedience class. I always start my dogs myself and then enroll them in a class to finetune the dog...and myself.