<?php
//show wordpress site title
 bloginfo( 'name' );
//show wordpress homepage url and support multi language
echo esc_url( home_url( '/' ) );
//page or post title
the_title();
//show the content of page or post
the_content(); // should be inside loop
//post thumbnail into src
the_post_thumbnail_url( 'xxx' ); //replace xxx with image size
//show auther name
the_author();