1. Visibility is an intangible aspect of search engine optimization, but it is every bit as important as the other three fundamental principles.
2. Content Organization Anyone can create content. A lot of people do. Organizing the content is the challenge.
3. Keyword Research Too much attention is given to "key words" and too little attention is given to "research". Keywords are meaningless until you know how they fit into the big picture.

you are right it is not a big deal to write content but the thing is that how to properly manage it?