Drupal 8.x

I've got about 8 css files but only style.css is linking correctly, other get the "Not Found" error. All the Js files link correctly as well. I have AllowOverride all set already on Apache and I have tried rebuilding several times (drush cr).

See link shows the style.css are in the same directory https://drive.google.com/open?id=1C5ipHH_EXW4sbAfODnEoTFwlnDT3E0hB

I don't understand this. Any recommendation is appreciated.

Or how can you set different css of nodes in certain category in a view?

Example:

View: Articles -> view of all articles

Article taxonomy term: success -> css: green letters

Article taxonomy term: failure -> css: red letters

I try to be a responsible Drupal.org user.  Been doing computer work a long time. I respect the work the developers do over in the issue queues and I read them carefully to learn.  I don't have the technical Drupal skills to make much of a contribution there, so rarely post.

Hi there. I see that hook_views_pre_build could be useful but I really don't know how to use it to modify the quantity of elements showed in a view in some breakpoint.

I want to display 4 elements in Tablet breakpoint (768px to 992px) and 3 in the remaining. This should be applied to "Similar articles" view.

Thanks for your time.

EDIT: solved using bootstrap CSS grids.

ok, so i migrated my site from local host to webserver ,

but now and then i change some css  on my local site and then update the files on my webserver which work.
but when i change a template file in my themes/.../templates folder  like adding attribute classes to files like: 

 user---field--profile.html.twig 

and i upload it  nothing happens 
I cleared all caches. but nothing .. do i need to replace other files aswell?  thx