Flowcharts with TiKZ

@Link{https://www.google.com/search?sxsrf=ALeKk01mQSEhrN1vPpvknky3hU-26rYnRQ:1598038539565&source=univ&tbm=isch&q=tikz+diagrams&client=firefox-b-e&sa=X&ved=2ahUKEwj0xvO7ha3rAhXvGbkGHVpzD9gQsAR6BAgMEAE&biw=1135&bih=677}{Google Search}