Read Joe Pulizzi's excellent book Epic Content Marketing. I started reading it after I wrote this post and it confirmed and expanded what I already knew about content marketing, with much more detail than I could ever go into here. Something Pulizzi emphasizes which I originally left out was the importance of focusing on producing mobile-friendly content, since smartphones are becoming the dominant way in which most of our customers access content. Also read Michael Hyatt's Platform, mentioned above. Frequent websites like those of Content Marketing Institute, Ragan, Copyblogger, Michael Hyatt, and Gary Vaynerchuk and sign up for their email newsletters. It won't take you long to become not just familiar with content marketing, but an expert.
It can help, but other degrees also have content writing value. For instance, the ability to synthesize and relate complex information is key to content writing, but can also be acquired from studies in education or philosophy. Companies that offer content writing positions tend to find it easier to train someone in a complex topic than to train someone to write, however. For example, as a healthcare professional with mediocre writing skills, you're less likely to be hired as a healthcare content writer than a strong writer with no healthcare background (but who can be trained in healthcare topics).
For businesses, sales letters are very important. Those in charge of writing the letter should research all that they can about their target audience and their product too. While composing the letter, you should be able to show your product or service in the best possible light to entice your readers and generate interest. To help captivate your audience, here are some tips: