How to get post image in worpdress or How to get post thumbnail in wordpress

//Default WordPress

// Thumbnail (150 x 150 hard cropped)

<?php    the_post_thumbnail( 'thumbnail' );       ?>

// Medium resolution (300 x 300 max height 300px)  
<?php the_post_thumbnail( 'medium' ); ?>  

 // Medium Large (added in WP 4.4) resolution (768 x 0 infinite height)    
<?php the_post_thumbnail( 'medium_large' ); ?> 

// Large resolution (1024 x 1024 max height 1024px)
<?php the_post_thumbnail( 'large' );  ?>    

// Full resolution (original size uploaded)
<?php the_post_thumbnail( 'full' );  ?>      

//With WooCommerce

// Shop thumbnail (180 x 180 hard cropped)

<?php the_post_thumbnail( 'shop_thumbnail' ); ?>  

// Shop catalog (300 x 300 hard cropped)
<?php the_post_thumbnail( 'shop_catalog' );  ?>   

 // Shop single (600 x 600 hard cropped)
<?php the_post_thumbnail( 'shop_single' ); ?>