How to modify pages in confluence-rest-api????

Question

Python

Good afternoon!
I can't figure out how to change the page code in confluence-rest-api.
I try through the put method from requests, nothing comes out.
I need to change the table on the page, I don't know how to do it. (Need to be inserted into a row in one of the columns)

I'm trying to follow this example:

def set_page_json(page_id,json_content):
    headers = {
        'Content-Type': 'application/json',
    }

    response = requests.put("https://confluence.corporation.com/rest/api/content/" + page_id, headers=headers, data=json.dumps(json_content),
                 auth=(user, password))
    return(response.text)

1) Why do we need headers? And where can I get these headers
2) What is meant by json_content? Is it just json code that I want to insert?
3)How to edit tables through this?? table itself in html