Rendering Post Metadata
There are two functions that allow easy access to metadata stored in the postmeta table: get_post_meta(), get_post_custom().
Please see the function reference on parameter details.
get_post_meta(
    int $post_id,
    string $key = '',
    bool $single = false
);
Example:
$wporg_meta_value = get_post_meta(get_the_ID(), 'wporg_meta_key');
Please see the function reference on parameter details.
get_post_custom(
    int $post_id
);
Example:
$meta_array = get_post_custom(get_the_ID());