A permanent link to an item (a blog post, an attachment, ...). The default structure is "?p=123", but WordPress can handle "pretty permalinks" and will rewrite them internally to the former version. If you have a question about special rewrite structures you should use the [url-rewriting] tag.
I'm trying to make a custom permalink structure for my posts. www.example.com / post / %post_id% / %posttitle% / In this permalink, the post's ID comes first, then the post's title after it. ...