Drupal 8.x

Hi I'm using Drupal 8, very interesting CMS :)
I need to show in the teaser only the first image of a multi field image field, how can I do that?
thanks

Hi everyone,
I'm using Drupal 8, someone can tell me how can I hide the /node page?
thanks

I am trying to create a subtheme of Bartik in Drupal 8 so I can have custom CSS. I've followed several sets of instructions on the web to no avail. Even if I leave custom css out of the equation, I can't get the sub theme to look like the parent theme. It looks like all CSS is missing. Can anyone point me at correct instructions for this?

I would like to disable accessibility to any node path on my current d8 site. I've looked into some modules but haven't found any for D8. Global Redirect is in development however when I try to install it says error. I guess the issue is regarding SEO and having two links to the same place indexed to the search engines. Is there another way I can redirect users to the homepage upon hitting a known system node. For example /node/88 I don't want to actually show the page but instead redirect to the URL alias instead.

I have a node in a D8 site that allows users to upload a files

I am writing some code that gets the node info via a sql statement from the node table
but how do I access the file information for this node that is in the file_managed table.

Thanks,

I apoligize if I am in the wrong forum and I welcome if you point me to the correct one

On my Drupal 8 intranet site there is a "Loading..." message that appears near the header when I am logged in and at the bottom middle when I am logged out on the home page and I can't figure out what is causing this or how to correct it to make the message go away. Any help would be greatly appreciated.

Thanks,
Matt