Let's say ( just two example)
- You need a custom button in only specific post / page. And you need to have the control of its position.
- You need to embed a third party widget (ie. a form) to post / page. And you need to set its attributes depending on the location.
Then we can build a Shortcode and used it as per requirement.
I can implement a basic Shortcode for this initial price. And extend it for further cost. Contact me for more details
Implement shortcode with 1 attribute