How to add dynamic content in title and meta description in wordpress theme for homepage, post page, category, tag and pages

You should use WordPress conditionals to determine which page you’re on, build the title based on that, then print the title.

<?php
  $sep = ' | ';
  $name = get_bloginfo( 'name' );

  if( is_home() || is_front_page() )
    $title = $name . $sep . get_bloginfo( 'description' );

  if( is_single() || is_page() )
    $title = wp_title( $sep, false, 'right' ) . $name;

  if( is_category() )
    $title = single_cat_title( '', false ) . $sep . $name;

  if( is_day() )
    $title="Post for the day " . get_the_date( 'j F, Y' ). $sep . $name;

  if( is_month() )
    $title="Post for the month " . get_the_date( 'F, Y' ). $sep . $name;

  if( is_year() )
    $title="Post for the year " . get_the_date( 'Y' ). $sep . $name;
?>
<title><?php echo $title;?></title>

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