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Create a custom template file node--type.tpl.php where type is the machine name of your content type.

Place it in your theme's template folder and clear/flush the cache to see changes.

Ex: Article content type: node--article.tpl.php

<?php print render($content['field_xxx']); ?>

// custom html goes here

<?php print render($content['field_yyy']); ?>

Create a custom template file node--type.tpl.php where type is the machine name of your content type.

Place it in your theme's templates folder /sites/all/themes/YOURTHEME/templates and clear/flush the cache to see changes.

Ex: Article content type: node--article.tpl.php

<?php print render($content['field_xxx']); ?>

// custom html goes here

<?php print render($content['field_yyy']); ?>

1. Create a custom template file node--type.tpl.php where type is the machine name of your content type. Place it in your theme's template folder and clear/flush the cache.

Create a custom template file node--type.tpl.php where type is the machine name of your content type.

Place it in your theme's template folder and clear/flush the cache to see changes.

Ex: Article content type: node--article.tpl.php

<?php print render($content['field_xxx']); ?>

// custom html goes here

<?php print render($content['field_yyy']); ?>

1. Option: Write a custom template file node--type.tpl.php where type is the machine name of your content type.

2. Make a custom module and use hook_node_view. Here is an example.

Bonus

If you need to add markup to the node/x/edit form

3. Option: Use the markup module to add custom HTML code.

1. Create a custom template file node--type.tpl.php where type is the machine name of your content type. Place it in your theme's template folder and clear/flush the cache.