Module development and code questions

So we have our oembed podcast player which works on websites if they have HTML editor.

However we have a client who uses Drupal and we would like to officially support the community. 

I have downloaded the Soundcloud media module - which is awesome start for us, as we can rip it apart and build the parts that we need. However I am wondering if anyone has skill set in working media and modules. Is there any well documented how-to develop for this area of the Drupal system?

Hi,

I want to display the values from a multi-select field.   I am able to display the key values ( 'cell_phone' instead of 'cell phone', for example.  I'm also getting a warning on the cat_type : " Undefined array key "cat_type"has not been defined." I thought I defined it.

This is the code.

What is causing the error and how can I get the values instead of the keys?

Thank you

I  do not see a way to search this forum for a topic that may answer my question. Am I missing something? Do I really have to go page by page to try and find a possible relevant question?

I would like to override a contributed modules menu title to something that better describes what it does in my use case. I do not want to use a hook. How do I do this in Drupal 10?

I have created a custom module that has a customized serializer for modifying some objects in the views Image.

However, I am encountering the following error:

Class Drupal\custom_serializer\Plugin\views\style\CustomSerializer extends unknown class Drupal\rest\Plugin\views\style\Serializer.

this is my code:
 

Hi team

I have the following issue:
I've created a module with a controller, and I've created another module with another controller. I've imported that controller there, but when I try to instantiate it, it shows the error: 'Instantiated class Drupal\custom_module\Controller\getItems not found.'

here is my code: