Site navigation for three reasons

Site navigation-SEO is to be profitable

Site navigation is crucial for three reasons
all of them fundamental to
SEO:
• Usability- helping users find what they want.
• Indexing- helping search engines find all your pages.
• Link power- distributing it to all your pages.
Only if a page is indexedby a search engine such as Google can it
appear on that engine’s results pages.

The least competitive of keywords, it is the most important factor in
determining where a page appears on search engine results pages
SERPs.
Link power is crucial and your pages can’t have enough of it (especially
the most important pages on your site - let’s call them your ‘Superman
pages’).
Good usabilityis a must if you want to maximize response. So let’s say
it’s a given that the usability team can do more or less what they want
and SEO must then adapt to that (without messing it up).
The first thing usability might ask for is a search box. That would work
for your site’s visitors, but is no use for SEO, as search engines (they are
simple things) can’t ‘search’ with search boxes. Search engines need
links.



Perhaps you’ve now planned your site’s structure consisting of a home
page, maybe five to ten category pages with five content pages each.
Or you might need only five pages in total on your site. Or already have a
site with thousands of content pages (perhaps articles or products) and
hundreds of category pages.
Of course this will depend on your particular circumstances.
But however large or small your site, you are going to need to create
content and optimize it.

You’ll want a content management system (CMS) to create and manage
pages yourself without the need for expensive and busy developers.
You’ll need flagship content that can be used to promote your site, build
your brand and get links from other sites.
You’ll also need lots of long tail content to target the long tail keywords
in your target niches.
Long tail content must still be interesting and good enough for users to
want to stay on your site and return.