ACF Fields - Basic

Display a field
<p><?php the_field('field_name'); ?></p>

Working with Images – URL
<img src="<?php the_field('image_test'); ?>" alt="" />

Working with Images – ID
<?php $image = wp_get_attachment_image_src(get_field('image_test'), 'full'); ?>
<img src="<?php echo $image[0]; ?>" alt="<?php echo get_the_title(get_field('image_test')) ?>" />