Building good SEO for your website is always going to mean having a good site structure. Much like the practice of a good architect, creating good site structure is all about planning the structure first and building the site second. Both humans and search engine crawlers are alike and both need a structured and well planned website with clear internal links for them to follow and reach the deep level. Getting your website listed in top SERP will not do any trick and your inner pages should be easily accessible from your home page / landing page. Keeping things simple would make easier for bots and users.

Keeping SEO aspects like internal link structure, text links may help you get higher SERP results. Properly planned and the considered application of website navigation and website structure serves two main purpose for SEO.

1. Indexation
2. Web Usability

Indexation: Good site structure means that search engine spiders will have an easier time indexing the information on your site to display in the search results. This is accomplished by the proper use of meta tags, effective and meaningful content, Keywords, URL's, sitemaps and other principles which let the spiders know which of your pages are the most important. XML Sitemap plays a vital role for search engines in indexing a website in a proper manner.

The XML sitemap protocol is specifically designed for spiders. In its simplest form, an XML sitemap is a 'behind the scenes' XML file, listing URLs for a site along with additional metadata about each URL (when it was last updated, how often it usually changes, and how important it is relative to other URLs in the site). It's a map of all links in a site, uploaded to the root directory of a website and invisible to visitors. XML site maps are accessible to all major search engines so they can more intelligently crawl the site through top and deep level links. For Flash-heavy sites or sites with image-based or JavaScript navigation, an XML sitemap is particularly vital. Search engines have great difficulty spidering these types of sites and historically SEO has suffered greatly as a result. By integrating an XML site map you can now completely open up your site and its content. Sitemaps are also implemented frequently to consolidate vast sites with depth to a manageable means. When a site contains a lot of archived content that is hard to find or isn't properly linked internally throughout the site, an XML map can reach deeply into the site's architecture, find and then index these pages.

Web Usability: Good site structure will make the purpose of your site clearer and will help you to achieve it by getting your customers to take the desired actions. In other words, if your site is structured to where it is easy to navigate and if your intentions are clear to the customer, they are more likely to stay on your site and take desired actions.

Research shows that 80% of usability is down to website structure and navigation. If users can't find what they want in three clicks, you've lost them, they bounce. Therefore it's critical to build an effective navigational structure. Good navigation improves visitor experience and helps users to move around the web site from one page to another, promoting the right pages, guiding visitors to the all-important calls to action that go to validate an organisations website presence. It would appear that generally web navigation and structure are to a degree improving usability slightly with common conversion rates now around 2% up from 1% at the beginning of the century.