I am discussing with you the five key elements for any website: search engine optimization(seo), performance, security, flexibility and content. Fortunately you can get the mostly all things except content(:)) with the help of additional plugins. I have multiple WordPress sites and my every site contains following plugins for the better seo, performance, security and flexibility.
For Search Engine Optimization
All in One SEO Pack
You can optimize your WordPress site for the Search Engines with the help of All In One Seo pack plugin. The plugin has great features like to optimizes your titles for search engines and generates META tags automatically. Now it supports the e-commerce sites.
Google XML Sitemaps
Sitemaps are so important for better indexing in all search engines including Google. Google XML Sitemaps plugin generates a special XML sitemap which will help search engines like Google, Yahoo, and Bing to better index your Websites or blogs.
W3 Total Cache
htaccess based BulletProof Security plugin protects your website against XSS, RFI, CRLF, CSRF, Base64, Code Injection and SQL Injection. It protects verious configuration files such as wp-config.php, bb-config.php, php.ini, php5.ini, install.php and readme.html with .htaccess security protection. Two years ago one of my site had been infected with unnecessary script injection. Then i have got the plugin and from that time everything is working good.
And In the last one of my favourite.
Ad Codes Widget
I use the Ad Codes Widget plugin to show the ads, script and php code in the custom widgets of the sidebar. It means you will have more control on the sidebar. You can show the data according you. If you have some knowledge of the basic web development then it would be great to manage your sidebars. This is also very helpful for the non programmer.
So above are the great plugins for your website. You can try…bye