Navigation is how a visitor traverses a web site with the use of their browser. Certain tools can aid visitors when they come to your site, such as providing menus, embedded hyperlinks, frames, a site map, or searchable databases. Depending on the size and type of web site you are looking to create, you may need to employ a combination of these tools to help visitors go quickly to the information they are seeking.
The decision as to what combination of techniques is most appropriate for your particular site, is usually best left to an experienced design professional, but you should know what your options are. In most cases the styles of navigation techniques employed on the site have less to do with a web author's personal preference and more to do with the layout of the content of the site. Content influences design. How that content is structured influences navigation of the site's contents. When thinking of the site's content and it's layout, think in terms of your longer term vision and be sure to share that vision with those who will be building your site.
Adding and changing content shouldn't mean overhauling your web site, but if you don't plan with the future in mind, you won't be prepared when it gets here.