Module development and code questions

I am using VBO to perform bulk comment publish/unpublish on my view. My view looks as below:

https://imgur.com/a/uqrWRFD

Now, i have added a custom dropdown along with the existing dropdown from VBO. I want to modify the existing "publish/unpublish" comment action to do something additionally. Where do i start for this? I have already added the new dropdown. I want to edit the action, but not sure where to start. Any support?

Hi,

Below force_password_change is not compatible with D9, So I did some modification in .info file and .module file. its working fine with D9, but I need to install using composer

https://www.drupal.org/project/force_password_change

Steps followed:

Created separate branch and raise merge request

https://www.drupal.org/project/force_password_change/issues/3220468

Please help a total Drupal/PHP noob out. I'm a student modifying a site that my organization inherited, and the site keeps encountering an error every time I try to add necessary modules to the site:

In Drupal market place the session limit module is available for Drupal 8.x version only.
Still now it is not release for Drupal 9 as per Drupal official community. In my current project(Drupal 9), there is a requirement,
which might be fulfil by this session limit module. But I have one concerned regarding this module,
does this module is compatible with Drupal 9 or not? Since, still there is no any official communication
from Drupal market place yet. Could you please suggest me, so that I can proceed this module with Drupal 9

Hello Everyone, 

I have tried installing Varbase Hero Media Slider today and later on I found out that it wasnt compatible with the latest drupal version I'm currently using. Therefore, I had decided to remove it through composer since it wasnt installed. After removing the module I'm unable to access the modules page as it says Page Not Found. 

I would highly appreciate it someone could help me out on this. 

Hi team,
I'm having some issues trying to save some field using paragraphs,
Where i run my code happen this:
The first field has value and second is empty
and the next block the first field is empty and second has value
screenshoot
This is my code: