Editorial design is not the same as advertising; advertising is not the same as book design. Each has a unique focus and target. In most cases, the tools are similar but the methodologies are not. Many graphic designers perform a broad range of tasks, switching media as clients and jobs demand. A designer cannot always afford to specialize because the volume of work in a specialty may not warrant it or competition may be too intense. Therefore, it is prudent at the outset of a career to learn about and practice all the disciplines that strike your interest and fancy as well as those that are growth areas for employment. Although it is not necessary to be expert in everything, it is useful to be fluent in as many forms as possible, at least while you are looking for your favorite genre.