Wanted Advice, Direction on Fetch/Retrieve Multiple Checkbox FROM Database PDO/PHP Tutorial [on hold]

Wanted Advice, Direction on Fetch/Retrieve Multiple Checkbox FROM Mysql Database PDO/PHP Tutorial. I have spent hours trying to find this. every tutorial I come across seems to be forms, without a database involved.

Does anyone know of any tutorials, or a simple code for retrieval from the database in PDO.

Thanks