Explain the_category() & the_title(),the_post().

Sure, these are WordPress template tags that are used to display or retrieve information about the post or category.

1. the_category(): This function is used to display the category or categories of a post. In a template file, it is used within The Loop. By default, the categories will be displayed as links and are separated by a comma.

   Here's a basic usage example:

   <?php the_category(', '); ?>
   

   This will display the post's category, separated by commas if there are more than one.

2. the_title(): This function is used to display the title of the post. It must be used within The Loop. By default, the title will be enclosed in h2 tags.

   Here's a basic usage example:

   <?php the_title(); ?>
   

   This will display the post's title.

3. the_post(): This function is used to set up post data. It is used within The Loop to set up the next post to be processed, setting the global $post variable to the next post in the queue.

   Here's a basic usage example:

   <?php 
   while ( have_posts() ) : 
       the_post(); 
       // Display post content
   endwhile; 
   ?>
   

   This will iterate over each post in the list of posts, setting up the post data for each one in turn.