Many URLs involve long lines of numbers and letters. This is a wasted opportunity! URL structure can actually add to a site’s search engine ranking if it is planned to include keywords.
Good URL structure should include keywords relevant to the page’s subject. They should also be straightforward. If you have URLs with duplicate content, specify a canonical, or preferred, URL for them so the search engines don’t reduce your ranking. Last, it is best if your URL hints at the organisation of your website. For example, mypets.com/furrypets/cats/siamese is a better choice than mypets.com/siamese.