Firstly, if you don’t like the behaviours your dog is displaying when they see other dogs/triggers, it’s best to not let your dog continually practice them. Unfortunately, the more a dog practices a behaviour, the better they get at it! Just as it works when practicing sitting for their dinner and they get really good at it, practicing something unwanted also makes them better at that. So, avoid walking your dog until you are at an appropriate place in your training plan.
You can replace walks with lots of alternative activities and an enrichment program, plus learning the skills required for your training program at home first. At best, find times of the day or areas you can walk/explore where there are no dogs/triggers around.
Then we encourage you to get guidance from a qualified positive reinforcement based trainer to teach you the skills to start to take your dog out and about and enjoy your walks.
Find out more about why dogs react, what it means, and how you can help in our full article on Reactivity In Dogs here.