https://stackoverflow.com/questions/41936473/echo-a-custom-pages-custom-field-outside-the-loop

Global query for custom fields

<?php

    global $wp_query;

    $postid = $wp_query->post->ID;

    echo get_post_meta($postid, 'Your-Custom-Field', true);

    wp_reset_query();

?>

Standard Field

<?php echo get_post_meta( get_the_ID(), 'custom_field_name', true ) ?>

True-False

<?php if ( get_field( 'custom_field_name' ) == 1 ) { echo 'content_name_or_class_name'; } ?>

True-False Conditional

<?php if ( get_post_meta( get_the_ID(), 'custom_field_name', true ) == 1 ) {
  //echo 'true';
} else {
  //echo 'false';
} ?>