Last year I wrote an “Intro to Post Meta” series of posts for wpsnipp.com. I highly recommend you check them out if you’re looking to learn how to use WordPress post meta.
- What is Post Meta? An intro to WordPress Custom Fields
- Post Meta.. How do I save it?
- Post Meta.. How do I save it? (add_post_meta)
- Post Meta.. Let’s make something!
- Post Meta.. The most valuable resources
If you read them and find them valuable, please let me know!
UPDATE 09-28-15: Though originally commissioned for wpsnipp.com, the original content has been taken down so I have been given permission to re-publish here. The links above reflect their new location on this site.
UPDATE 03-12-16: Tom McFarlin has written several excellent posts on working with Metadata in WordPress, and covers other areas like user meta, comment meta, and even the new term meta. I definitely suggest you check it out as well.