Theme development

I wanted to use javascript to delete an option from the list of options in case the user is not an administrator and I searched and found this code inside a post and I used it inside the project's themes->mythemename->mythemename.theme file, but that didn't work and I have several problems I want to know how to solve, as I searched a lot I did not find a solution

I'm doing a test on Bootstrap Barrio, but it can apply to all bootstrap/standard subthemes

I've created a custom Barrio subtheme, let's call it 'orange', and I've created a twig file that allows to display the copyright info without install a module.
The twig code:

<div class="copyright">
&copy; {{ "now"|date("Y") }} {{ site_name }}, {{ "some text" }}, All rights reserved.
</div>

Hi,

I'm trying to expand the range of html tags that can be used in the 'Help Text' for fields. I’d like this to be applied to all fields.

I've been trying to use a D7 example and updating for D8/9, but I'm running into problems. This has led me to a lot of API stuff, that I'm not fully sure I'm understanding.

Here's what I've got:

I'm trying to inspect the $variables that is available to a preprocess function, e.g.:

function mytheme_preprocess_node(&$variables) {
  debug($variables);
  ...
}

It doesn't work (site just crash).  Also tried dpm() and kint() with no luck. Google told me that others also struggle with this., but found nothing that actually worked.

Greeting,

I have my custom theme with some regions. For admin purpose I am using a Seven theme. Currently, if I have some blocks in regions presented in Custom theme but missing in admin Seven theme (for example some footer widgets), these blocks are shown in admin theme in main content region like just stacked "all block without found regions".

I can set up a block visibility by urls like "not showing to admin/* node/* " etc but it seems a bit wierd, because I need only a main content area (id=block-system-main)

I am working on a theme for Drupal 8/9 that is based upon Bootstrap 5. I use sass to generate style.css from .scss-sources.

I have a content type named "Polaroid". It has fixed width an height (300 by 350 px). I want to show this content stacked sideways. The visual effect I am looking for is similar to what you could get with the Drupal 7 project DAN Polaroid (screenshot below):