How to Stop My Dog Barking SO MUCH?

Thanks for your tips!! I wish I had seen them earlier, but I hope it’s not too late to teach my dog not to bark. Tbh when my doggy was younger, I didn’t pay enough attention to the loud barking. I mean, she was a puppy, so I was OK with it. She’s grown up, and your barking has become louder, so I’m here. I also have a friend who works at https://www.servicedogregistration.org , so I think he could help me. See, I want to register my dog as a service dog, but first, I want to teach her not to bark. That’s too loud, doggy. Thanks again for your suggestions!