Drupal 8.x

After deinstalling a module (I guess it was a lazy images module) the nodes lost their text-format, although it is required. Now I'm looking for way to fix this, because I have hundreds of nodes with this issue. I would appreciate any ideas.

Hi guys,

I' trying to convert a Drupal 7 template to Drupal 8 twig template and I have converted almost but I stuck on a logic. 

This is the Drupal 7 logic: 

<span class="rk-icon <?php
if ($icon == 'settings'){
    $icon = 'settings-class-icon-large';
}

elseif ($icon == 'affiliates') {
    $icon = 'affiliates-class-icon-large';

}
else {
    $icon = 'icon-class-'. preg_replace('/s$/', '', strtolower($icon)) . '-small';
}
print $icon; ?>"></span>

And I want this in my Drupal 8 twig.

I created a "Categories" taxonomy vocabulary with the following terms and child terms :

- Crypto
-- Binance
-- Ledger
-- Metamask

- Geek
-- Security
-- Apple

...

The "tags" field allows you to select the categories in the nodes form. A node can have only one category.

Here is my problem

I want to create a Views block on the node pages, which displays other nodes belonging to the same terms and child terms.

Here is an example :

I customized an SVG file on the website below, to make a background in a block :

https://heropatterns.com/

When I paste the code in my style.css file the code is hundreds of lines long :

Drupal.org is nice, esp. for its collection of modules. But I have the feeling drupal.org's forum is not really the place to be for information. And when you look at the level of (in)activity on certain sub-forums of drupal.org/forum (just check the age of the Last Posts), things don't look so encouraging. So: Which Drupal related site is the best / fastest / most comprehensive / most responsive / most active?

Maybe I'm asking this in the wrong place, but where else to go... Flame me if my question is not appropriate for this forum.

Any ideas? Thanks!