Drupal 8.x

Hi,

I need to prepopulate the role field on the user add form depending on the current user role.
I already tested the populate module on D8, but the checkbox field can't be prepopulated...
I have tried to hook the user_insert function with this :
 

Requirements : I am looking for a solution where i can change the content the content of block with my custom logic.

Detail: i am using Paragraph modules one of paragraph type is paragraph block where i can add block which i already created from block layout

/block/add?destination=/admin/structure/block/block-content

there i create a simple block with blank or dummy content.

How do  implement contextual filter where the results of the view limited to content that has particular field value only. I have the user id context which is working well but the context for fields with specific value is where I'm stuck. Thanks for any suggestion.

I am using paragraph module and create paragraph types as well. I create a content type Quiz where i add paragraph field as reference.

i create a quiz page and create three paragraphs now i want to show index or counter or paragraph on paragraph.html.twig template but i how can i print the counter / index so it gave me

paragraph1

paragraph2

paragraph3 etc

I have fields in my database that repeat for the same answer to the first drop down box.  In other words, based on a drop down box of 20 choices, some fields can be populated with the same answers, or if the choice already exists, those extra fields do not appear in the form because they are not necessary.  We have 20 companies let's say, but 100 deals.  One company may have many deals but the data in the 5 fields is the same for each company (entry).  The list of companies is updated by me manually in the list (text) content types under structure.

For registration I have several yes/no questions and based on answers I'd like to redirect users to a web form.  I.e. 

Are you a human?  If the answer is YES - go to 'human' webform.

Are you a plant?  If Yes, go to 'plant' webform.