Here I plan to link to articles, blog posts, and other advice pertinent to protecting the work. Because you worked hard to create it, you should work hard to protect it.

I copied this from copyright.gov

What does copyright protect?
Copyright, a form of intellectual property law, protects original works of authorship including literary, dramatic, musical, and artistic works, such as poetry, novels, movies, songs, computer software, and architecture. Copyright does not protect facts, ideas, systems, or methods of operation, although it may protect the way these things are expressed.

Can I copyright my website?
The original authorship appearing on a website may be protected by copyright. This includes writings, artwork, photographs, and other forms of authorship protected by copyright.

Can I copyright my domain name?
Copyright law does not protect domain names. The Internet Corporation for Assigned Names and Numbers (ICANN), a nonprofit organization that has assumed the responsibility for domain name system management, administers the assignation of domain names through accredited registers.

How do I copyright a name, title, slogan or logo?
Copyright does not protect names, titles, slogans, or short phrases. In some cases, these things may be protected as trademarks. Contact the U.S. Patent & Trademark Office, 800-786-9199, for further information. However, copyright protection may be available for logo artwork that contains sufficient authorship. In some circumstances, an artistic logo may also be protected as a trademark.

How do I protect my idea?
Copyright does not protect ideas, concepts, systems, or methods of doing something. You may express your ideas in writing or drawings and claim copyright in your description, but be aware that copyright will not protect the idea itself as revealed in your written or artistic work.

Does my work have to be published to be protected?
Publication is not necessary for copyright protection.