This is my first wordpress. Version 3.5.1. I am using Twenty Twelve theme. My experience with cascading style sheets is limited.
path1 -- Dashboard -- Appearance -- Editor -- style.css -- Update
When I use path1 to modify my style.css, I never see any changes to my website's appearance.
path2 -- Dashboard -- Appearance -- Background
When I use path2 to modify my website, I see changes.
I found an article that told me to use a child theme so I installed a child theme and realized (after I successfully installed and activated the child theme) that the css examples don't work.
I selected and cut all the code and updated a blank style.css. The website looks unchanged.
What am I doing wrong? What is the proper way to edit or update changes to style.css?