Extending Drupal 8 custom block types - naming conventions/theming

Is it possible to extend D8's custom block types without using a module?
To open, very familiar with Drupal 8 Naming Conventions .
In regards to the blocks section, it covers extending blocks via modules. I understand this very well...

Bubbleable metadata

The parent page explains cacheability in general. This looks in detail at how render arrays bubble cacheability.

Managing Drupal 8 With Composer

I am very new to Drupal (sorry if my questions are stupid) but not at all new to Composer management. I am trying to understand how to manage a Drupal 8 install through composer. To my understanding these steps are taken before install:

  1. Change the autoloader to load /vendor/autoload.php instead of /core/vendor/autoload.php
  2. Run composer install

The problem I see is the packages for drupal/core are duplicated in /vendor as well as /core/vendor

Bundle Payment

I want to know, is there any method using which I can set multiple payments based on the quantity of the product.
Here is an example
Suppose 1-5 $20 / product, 5-10 $18 / product and 10 or more $15 / product.

Your help would be much appreciated.

Drupal Consultant Needed

Drupal Consultant needed - experienced, knowledge of Taxonomy, Core updates, update to Drupal 8, Danland theme and much more.

Paid hourly, as needed, ongoing.

New to Drupal, need theme for responsive site

I need a theme for a site that is currently written in PHP. I need a theme as close as what we currently have. Please contact me if you would like to develop the theme. Don't forget to let me know how much it would cost. Thank you.

Current site: http://www.local2627.org/

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