Add this function in your function.php file.
function custom_excerpt_length( $length ) {
return 40;
}
add_filter( 'excerpt_length', 'custom_excerpt_length', 999 );
function new_excerpt_more( $more ) {
return ' ' . __('Read More', 'your-text-domain') . '';
}
add_filter( 'excerpt_more', 'new_excerpt_more' );
Add the following tag in content file: