URLs are one of the most important of all on-page SEO elements, and the way in which they are constructed can make or break an optimization campaign. If you’re one of the lucky few site owners with a site designed with SEO in mind, the likelihood is that you’ve already had more than one lengthy meeting with your web designer about the best way to form URL structures.
Unfortunately, not all websites are built with SEO in mind, making the task of URL optimization a tricky one when your thoughts turn to improved organic rankings. If your site has more than a dozen or so pages, renaming each page and changing your entire URL and navigation structure becomes a massive task.
- The shorter the URL, the more successful it will be
- A good URL will describe the content of the page
- URLs can be constructed using upper and lowercase or a mixture of both
- There are no longer any hard and fast rules that say hyphens are better than underscores, but using a hyphen instead of an underscore (_) is much more human-friendly.
- When you have decided on a URL structure, put that thinking into practice across the site, not just in one or two categories.
- Google’s Matt Cutts has gone on record as saying the search engine is happy to crawl any page extensions..
Aigc Northamerica tip :stay away from .net or .asp , google will never say it, but we will 
