The best permalink structure for SEO is /%postname%/ or if you want to use the category name /%category%/%postname%/
How to create and optimize your robots.txt file in your WordPress site. Allow the search engine to index your posts but block them to index core folders.
How to add a 301 Moved Permanently redirect without affecting your SEO.
How to change the URL structure (Permalinks) to improve your site SEO with WordPress.
You can remove the .html extension from the Category and Product URL easly. Better SEO for your Magento store.
Optimize your theme for SEO (Search Engine Optimization). Use the H1, H2 tags on index.php, single.php… Validate your output code with the W3 Validator