Drupal 8.x

Hi there,

I am new to drupal module development.
Please forgive me if the question is too simple.

This question is two fold:
First about strategy: am I going in the right direction?
Second about how to do it... 

Hello

Do you know views filters. The below link will demonstrate how I have manage to filter the content type "client" to the logged in user to allow only the company the user is associated with. 

This seems to work fine with "sub-users" and only filters the one company the users are associated with when they are logged in. However when super admin views this same view it is demonstrating multiple of single nodes.

I can't update my Composer. When I use composer update, I have  "The `url` supplied for the path (composer/Plugin/ProjectMessage) repository does not exist" error.

I have read somewhere that CCK functionality has moved into core, but I can't figure out how to add a custom field to a content type's display.

How would I display a link in the form in Drupal 8, for example "add a review", providing the Node ID to the next form?

Using prepopulate (https://www.drupal.org/project/prepopulate) for Drupal 8, the link would look like this:

http://www.example.com/node/add/page?edit[field_entity_reference][widget][0][target_id]=123

Drupal 8, Lightning 4.101:

I have a view page listing articles that have image and rich-text fields as teasers. The image is styled to float left of the clipped rich-text. However, the clipped text is unexpectedly including any inline images.

Is there a way to stop inline images in the rich-text from being included in the teaser so that only the text is displayed?

One of my sites does not update properly with composer. I manually put in the new 8.4.4 core into web and then do: