Show all posts from the tags without having to set all of them

WP default loop will automatically show the posts with in current tag on tag.php page. you dont need to set custom WP_Query for that but make sure that you are not modifying the loop from any other method.

if( have_posts() ) : while( have_posts() ) : the_post();

   the_title();
  //Rest of code.

endwhile;
endif;

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