How can I customize the layout and design of my Drupal site?

To customize the layout and design of your Drupal site, you can use themes and templates. Themes control the overall look and feel of your site, while templates allow you to control the layout and design of individual pieces of content. You can create custom templates for specific content types or use pre-built templates provided by your theme. Additionally, you can modify the CSS and JavaScript files associated with your theme to change the visual design of your site.