Drupal 8.x

I'm trying to change Bootstrap colors, but it doesn't work. Here is the error message :

I have created a view to list all of one content type. On the view I would like to insert filters that would select only content of a certain year and a certain month or a certain Author. 

I installed the Twig Tweak module on my site to render Views on the home page.

I want to make the display mode frontpage_tasks for the current user, his account, his stores and his groups.

{{ drupal_entity('user', user.id, 'frontpage_tasks') }}
{{ drupal_view('accueil_page_liste_des_taches_boutique', 'block_1') }}
{{ drupal_view('accueil_page_liste_des_taches_groupe', 'block_1') }}

Here is one of my Views :

In

function custom_module_preprocess_node(&$variables) {

I have a content type 

$variables['node']->getType() == 'bookmark') && $variables['view_mode'] == 'full'

and I want to check if the node is "promoted, sticky or in_moderation".

https://prnt.sc/wnfxo0

How do I do this?

I tried several ways with no luck

I have installed the module 'Easy Breadcrumbs' on the site www.seniorama.one.

But it is not working as it should.

Which settings do I have to change?

I want to create an image gallery like this one: https://www.seniorama.be/uitdeoudedoos

I have installed Colorbox and IMCE.

I did everything from this document: https://www.ostraining.com/blog/drupal/drupal-8-responsive-colorbox-gall...

This is what I already have: https://www.seniorama.one/en/Uitdeoudedoos