Drupal 8.x

I've just upgraded our main business site to Drupal 8 - what do you think?

https://turtlereality.com

I love Drupal 8, although sometimes hate composer... It's a love hate thing.

Anyway, really grateful for any feedback

I am on a debian 9 server and git is asking for username

what should I do?

Package operations: 19 installs, 2 updates, 0 removals
  - Installing drupal/coder (8.3.1):     Authentication required (git.drupal.org):
      Username:

Dear Drupal community,

Hi, 

I have a decoupled system where Drupal 8 is the backend presenting json data to front end. Now, all works fine, with the exception of exceptions (excuse the pun).

When the page does not exist I throw exception with a simple message, like this:

throw new NotFoundHttpException(t('URL @url was not found', array('@url' => $url)));

and on the the front-end I get a response with status 404 the content like this:

message: "URL /sample-missing-page was not found"

Hi,

I am started dev on Drupal 8.6.0 and have since updated to 8.6.3. I have also cleared caches, run updates and cron.

I have set up a content revisions review:

FIELDS
Content revision: Revision create time
Content revision: Revision ID
Content revision: ID

FILTER CRITERIA
Content revision: Published (= Yes)

SORT CRITERIA
Content revision: Revision create time (desc)

CONTEXTUAL FILTERS:
Content revision: ID

I'm going to attempt a simple family tree module in drupal 8.   This will be my first drupal 8 module so I'm looking for some rough guidance.     

This is the layout.   Each person has their own node with their mother and father as fields.    When I click on the family tree tab, it will show a family tree, query the mother and father fields and grab the mother and father for each of those going back 3 generations.    Simple right lol?