Factors to consider. When selecting a WordPress theme demo, consider how well it aligns with your vision for your site. Look for themes that offer responsive design, compatibility with essential plugins, and customization options to tailor the site to your needs. Also, consider the theme's performance and speed because these can significantly affect your site's user experience and SEO. Popular theme demos. There are countless WordPress themes available, but there are some that stand out for their quality and versatility. Examples include Astra, OceanWP, and Divi, which offer a range of demo content tailored to different niches like business, blogging, eCommerce, and portfolio sites. These themes are known for their ease of use, extensive customization options, and strong support communities.