Learn more about copywriting from English majors with real-life experience:
Online Resources
Content Marketing Institute - Articles tailored specifically to copywriting and content marketing.
ABC Copywriting - Focuses on not only copywriting, but also copywriting in conjuction with other fields such as politics, psychology, and more.
"The 10 Commandments of Copywriting" by Entrepreneur - 10 cardinal rules to follow as a copywriter.
"101 Copywriting Do's & Don't's" by Copyhackers - 51 "do's" and 50 "don't's" for creating a great copy.
"Writing Headlines that Get Results" by Copyblogger - How to effectively develop article headlines.