Drupal 8.x

I'm running Windows 7 64bit with WampServer 3.1x (also 64bit) to do my Drupal 8.3.4 development work. I need some insights into how to use an alias with Drupal 8.3.4.

In my HOSTS file, I have the following entries:

::1 localhost.foobar.com #Pre-existing Drupal 7 project.
::1 localhost.d8.foobar.com #The Drupal 8 project I'm trying to work on.

I have Aggregator set up and working fine, pulling in RSS feeds. While everything "works", I have encountered an issue that I would like to fix/make better. My site is all responsive, and everything else adjusts to work with the screen size of the device, however, one of the RSS feeds has this HUGE (like 4k size, currently non-responsive) header image with it. As this code changes each time they update the feed, I obviously can't just update the code. Is there some way to force images via RSS to be responsive?

I managed to install a Views slideshow in Bartik in Drupal 8. It looked great. 

It still looks great in previews but I can't make it come up on the page. 

In the preview I get the message: 

Does anyone have idea what might be happening? 

This the first thing I've tried to do since installing Drupal. I'm not a coder. Talk to me like a little child. 

I managed to install a Views slideshow in Bartik in Drupal 8. It looked great. 

It still looks great in previews but I can't make it come up on the page. 

In the preview I get the message: 

Does anyone have idea what might be happening? 

This the first thing I've tried to do since installing Drupal. I'm not a coder. Talk to me like a little child. 

Hi,

in admin/people :

the actions concerning role are not translated :

Add the "X" role to the selected user(s)

Remove the "X" role to the selected user(s)

When I go to admin/config/regional/translate

Add the @label role to the selected user has a good string??