Drupal 8.x

A D8 "Hello World" module without any dependencies. Will be highly appreciated. Honest!

I am trying to create a view that lists taxonomy terms without description.

I added "taxonomy term: description" to the filter criteria, and tried the following:

* operator: is equal to; value: empty
* operator: length is shorter than; value: 1
* operator: regular expression; value: ^$

but none of them worked.

I looked into the database (I use PostgreSQL 9.6.1) and found out that taxonomy_term_field_data.description__value has no value if there is no description for the term.

Paragraphs is a popular module for Drupal 8. Its documentation is here: How to start with Paragraphs for Drupal 8?
However, while following the instructions, I encountered these problems.
When I take this step in my drupal 8.25 installation:
3.Create a Entity Reference Revisions field on the node/entity type, like admin/structure/types/manage/page/fields for the Basic Page type of node or admin/structure/block/block-content/manage/basic/fields for blocks.

So, being new to Drupal, I’ve been working on this issue for the last couple days and finally discovered the solution. The specific issue is that I wanted to create articles for my Drupal website; however, I wanted to keep them contained within specific pages. In other words, if I had written an article about cars, I would want that article to be displayed only on the the Car page. When I first created my Drupal site, I ran into an issue where every time I created an article, that content would display on all my pages, not just one specific page.

Keeping Content Restricted to One Page on a Multi-Page Site

I'm processing some data to create node in Drupal 8.
One snag I have hit is with link fields. I am adding url and title to the field. when viewing the node in Edit form seems so display correctly, but when viewing the node I get 'website encountered an issue error'

Log shows:
Error: Unsupported operand types in Drupal\link\Plugin\Field\FieldFormatter\LinkFormatter->buildUrl() (line 245 of html/core/modules/link/src/Plugin/Field/FieldFormatter/LinkFormatter.php) #0

I am updating the field as below: