Drupal 8.x

I have a site built from Drupal which contains many sub channels (defined by taxonomy terms), and each sub channel may need to use a different theme. I see there is a module called ThemeKey which may be able to do this, but unfortunately it is currently not working on Drupal 8.

I see a solution which is to implement ThemeNegotiatorInterface, so I tried to create a custom module named custom_theme, then added a custom_theme.services.yml with the following lines:

I have a view in which I have exposed filters. I am also using the Better Exposed Filter Module to create some checkboxes.

1 - I created the view based on fields (Materials and Machines)
2 - The Filter Criteria is exposed
3 - Created a page from it and all worked well.

4 - I then had to add 1 new material (IRON) and 3 new machines (ICON's) to their respective taxonomies.
5 - I then added that new content.

6 - Flushed Cache as a matter of protocol.

Hi, I am a Drupal newbie. I've just started to explore the Drupal Engine, and now I'm creating my own theme.
But I cannot do this, because every single change requires clearing the cache.
I have to go to the admin panel and click "Clear cache", and btw it takes quite a lot of time to complete.
So basically it is impossible to develop.

I have read a lot of tutorials and articles about disabling, but this still doesn't help.

Here is my file sites/default/settings.local.php

I get the following error when trying to clear cache on a Drupal 8 site. Any ideas?

Hi,

In my test site I have two basic pages: "Welcome" and "About Us"

"Welcome" page is used as custom home page. Its URL alias is generated by Pathauto module and is called "/welcome"