Code examples from the "Display Paragraphs Edge-to-edge using Bootstrap in Drupal 8" tutorial (http://www.webwash.net/node/262) on http://www.webwash.net.

page--node.html.twig

{#
/**
 * @file
 * Default theme implementation to display a single page.
 *
 * The doctype, html, head and body tags are not in this template. Instead they
 * can be found in the html.html.twig template in this directory.
 *
 * Available variables:
 *
 * General utility variables:
 * - base_path: The base URL path of the Drupal installation. Will usually be
 *   "/" unless you have installed Drupal in a sub-directory.
 * - is_front: A flag indicating if the current page is the front page.
 * - logged_in: A flag indicating if the user is registered and signed in.
 * - is_admin: A flag indicating if the user has permission to access
 *   administration pages.
 *
 * Site identity:
 * - front_page: The URL of the front page. Use this instead of base_path when
 *   linking to the front page. This includes the language domain or prefix.
 * - logo: The url of the logo image, as defined in theme settings.
 * - site_name: The name of the site. This is empty when displaying the site
 *   name has been disabled in the theme settings.
 * - site_slogan: The slogan of the site. This is empty when displaying the site
 *   slogan has been disabled in theme settings.
 *
 * Navigation:
 * - breadcrumb: The breadcrumb trail for the current page.
 *
 * Page content (in order of occurrence in the default page.html.twig):
 * - title_prefix: Additional output populated by modules, intended to be
 *   displayed in front of the main title tag that appears in the template.
 * - title: The page title, for use in the actual content.
 * - title_suffix: Additional output populated by modules, intended to be
 *   displayed after the main title tag that appears in the template.
 * - messages: Status and error messages. Should be displayed prominently.
 * - tabs: Tabs linking to any sub-pages beneath the current page (e.g., the
 *   view and edit tabs when displaying a node).
 * - action_links: Actions local to the page, such as "Add menu" on the menu
 *   administration interface.
 * - node: Fully loaded node, if there is an automatically-loaded node
 *   associated with the page and the node ID is the second argument in the
 *   page's path (e.g. node/12345 and node/12345/revisions, but not
 *   comment/reply/12345).
 *
 * Regions:
 * - page.header: Items for the header region.
 * - page.primary_menu: Items for the primary menu region.
 * - page.secondary_menu: Items for the secondary menu region.
 * - page.highlighted: Items for the highlighted content region.
 * - page.help: Dynamic help text, mostly for admin pages.
 * - page.content: The main content of the current page.
 * - page.sidebar_first: Items for the first sidebar.
 * - page.sidebar_second: Items for the second sidebar.
 * - page.footer: Items for the footer region.
 *
 * @see template_preprocess_page()
 * @see html.html.twig
 *
 * @ingroup templates
 */
#}
{% set container = theme.settings.fluid_container ? 'container-fluid' : 'container' %}
{# Navbar #}
{% if page.navigation %}
  {% block navbar %}
    {%
      set navbar_classes = [
        'navbar',
        theme.settings.navbar_inverse ? 'navbar-inverse' : 'navbar-default',
        theme.settings.navbar_position ? 'navbar-' ~ theme.settings.navbar_position|clean_class : container,
      ]
    %}
    <header{{ navbar_attributes.addClass(navbar_classes) }} id="navbar" role="banner">
      <div class="navbar-header">
        {{ page.navigation }}
        {# .btn-navbar is used as the toggle for collapsed navbar content #}
        <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
          <span class="sr-only">{{ 'Toggle navigation'|t }}</span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </button>
      </div>

      {# Navigation (collapsible) #}
      {% if page.navigation_collapsible %}
        <div class="navbar-collapse collapse">
          {{ page.navigation_collapsible }}
        </div>
      {% endif %}
    </header>
  {% endblock %}
{% endif %}

{# Main #}
<div role="main" class="main-container js-quickedit-main-content">
  <div class="container">
    <div class="row">
      {# Header #}
      {% if page.header %}
        {% block header %}
          <div class="col-sm-12" role="heading">
            {{ page.header }}
          </div>
        {% endblock %}
      {% endif %}

      {# Highlighted #}
      {% if page.highlighted %}
        {% block highlighted %}
          <div class="highlighted">{{ page.highlighted }}</div>
        {% endblock %}
      {% endif %}

      {# Breadcrumbs #}
      {% if breadcrumb %}
        {% block breadcrumb %}
          {{ breadcrumb }}
        {% endblock %}
      {% endif %}

      {# Action Links #}
      {% if action_links %}
        {% block action_links %}
          <ul class="action-links">{{ action_links }}</ul>
        {% endblock %}
      {% endif %}

      {# Help #}
      {% if page.help %}
        {% block help %}
          {{ page.help }}
        {% endblock %}
      {% endif %}
    </div>
  </div>
  {# Content #}
  <section>
    {# Content #}
    {% block content %}
      <a id="main-content"></a>
      {{ page.content }}
    {% endblock %}
  </section>

</div>

{% if page.footer %}
  {% block footer %}
    <footer class="footer {{ container }}" role="contentinfo">
      {{ page.footer }}
    </footer>
  {% endblock %}
{% endif %}

paragraph--content.html.twig

{#
/**
 * @file
 * Default theme implementation to display a paragraph.
 *
 * Available variables:
 * - paragraph: Full paragraph entity.
 *   - id: The paragraph ID.
 *   - bundle: The type of the paragraph, for example, "image" or "text".
 *   - authorid: The user ID of the paragraph author.
 *   - createdtime: Formatted creation date. Preprocess functions can
 *     reformat it by calling format_date() with the desired parameters on
 *     $variables['paragraph']->getCreatedTime().
 * - content: All paragraph items. Use {{ content }} to print them all,
 *   or print a subset such as {{ content.field_example }}. Use
 *   {{ content|without('field_example') }} to temporarily suppress the printing
 *   of a given child element.
 * - attributes: HTML attributes for the containing element.
 *   The attributes.class element may contain one or more of the following
 *   classes:
 *   - paragraphs: The current template type (also known as a "theming hook").
 *   - paragraphs--type-[type]: The current paragraphs type. For example, if the paragraph is an
 *     "Image" it would result in "paragraphs--type--image". Note that the machine
 *     name will often be in a short form of the human readable label.
 *   - paragraphs--view-mode--[view_mode]: The View Mode of the paragraph; for example, a
 *     preview would result in: "paragraphs--view-mode--preview", and
 *     default: "paragraphs--view-mode--default".
 * - view_mode: View mode; for example, "preview" or "full".
 * - logged_in: Flag for authenticated user status. Will be true when the
 *   current user is a logged-in member.
 * - is_admin: Flag for admin user status. Will be true when the current user
 *   is an administrator.
 *
 * @see template_preprocess_paragraph()
 *
 * @ingroup themeable
 */
#}
{%
set classes = [
'paragraph',
'paragraph--type--' ~ paragraph.bundle|clean_class,
view_mode ? 'paragraph--view-mode--' ~ view_mode|clean_class,
'container',
]
%}
<div{{ attributes.addClass(classes) }}>
    {{ content }}
</div>