Vice President of the United States (President of the Senate)
https://www.senate.gov/artandhistory/history/common/briefing/Vice_President.htm

The Executive Branch
https://www.whitehouse.gov/about-the-white-house/the-executive-branch/

What Does the Vice President Do, Anyway?
https://www.livescience.com/5113-vice-president.html

9 Things You Should Know About the Vice Presidency
https://www.history.com/news/9-things-you-should-know-about-the-vice-presidency

Vice: What the movie gets right and wrong about Dick Cheney
https://www.politifact.com/article/2019/feb/08/vice-what-movie-gets-right-and-wrong/

America's Worst Vice Presidents
https://time.com/4314491/americas-worst-vice-presidents/