It’s a cyclical process, but to begin when you are preparing anything keep the leftover celery or onions, or carrots in a plastic bag in the fridge. (But it can be squash or broccoli anything uncooked)
Then you get a rotisserie chicken, clean all the chicken off the bones. Put the bones and skin in a large pot and cover with low sodium chicken broth and water and all the onions carrots and celery. Bring to a boil and let it cook for at least 3 hours. (you will need to keep adding water to this as it cooks down.
This makes a broth so rich and tasty. Now, you can do this other ways, take a chicken and roast it yourself.
Strain all of the bones and everything keep the broth. To make the soup put into it whatever you like in soup or keep it simple with celery and carrots and the meat you pulled off of the bones. Season the soup with italian seasoning and lemon pepper and fresh parsley.