Theme development

I installed the Group module on Drupal 8 :

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

If I add the code {{ group.id }} in the TWIG of the group, it does not display the ID.

How to print the group ID in TWIG ?

Hello! I use the Barrio Bootstrap  SASS Subtheme. I got an error, cause www.xyz.com/libraries/bootstrap/js/bootstrap.js?pzftt0 is wrong. The library directory is in sites. Whère can I fiix this?

Hi, I am new to Drupal and decided to kind of jump in the deep end. I am developing a kind of portfolio site for myself using Threejs.

I am trying to call my featured image from a product, page, or post as well as the url to the page its located on, into javacript.

If someone could please point me in the right direction, that would be great. Thank you.

I'm trying to add more regions to a sub theme (barrio).

I have added the region to the theme.info.yml region section 

regions:
  main_header: 'Main header'

in the _page.html.twig file I added:

        {% if page.main_header %}
        <div class="container-fluid">
          <div class="row">
            {{ page.main_header }}
          </div>
        </div>
        {% endif %}

The region is appearing on the structure/block page. 

Hello,

Does anyone know of a Drupal 8 theme, like Box_grey from Drupal 6 (..using boxed side navigation bars)?  Thanks.

Chris