get theme path in wordpress

<img src="<?php echo get_template_directory_uri(); ?>/images/logo.png" width="" height="" alt="" />

// Get template directory example:
<img src="<?php echo get_template_directory_uri(); ?>/images/logo.png" />

// If you use child theme you will have to use another function:
<img src="<?php echo get_stylesheet_directory_uri(); ?>/images/logo.png" />
  

echo get_stylesheet_directory_uri();

include( get_template_directory_uri() . '/includes/my_file.php' );