Block Type Template

Create block type
Field - Title, body, image, link,
help - https://medium.com/@sarahcodes/custom-block-type-for-hero-banners-in-drupal-8-7d0adb665fd3

Twig Field value - https://blog.usejournal.com/getting-drupal-8-field-values-in-twig-22b80cb609bd
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1. themename.theme
/**
 * Implements hook_theme_suggestions_HOOK_alter() for form templates.
 */
function bartik_theme_suggestions_form_alter(array &$suggestions, array $variables) {
  // Block suggestions for custom block bundles.
  if (isset($variables['elements']['content']['#block_content'])) {
    array_splice($suggestions, 1, 0, 'block__bundle__' . $variables['elements']['content']['#block_content']->bundle());
  }
}
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2. template name - block--whatwellbemaking.html.twig

<div class="jumbotron jumbotron-fluid" style="background-image: url({{ file_url(content.field_image['#items'].entity.uri.value) }}); background-size: cover; background-position: center" >
  <div class="container">
    <div class="row">
      <div class="col-6">
        
        {{ title_prefix }}
        {% if label %}
          <h2{{ title_attributes.addClass('display-4') }}>{{ label }}</h2>
        {% endif %}
        {{ title_suffix }}

        <div class="lead">{{ content.body }}</div>
        
        <div><a href="{{ content.field_button[0]['#url'] }}" class="btn btn-primary">{{ content.field_button[0]['#title'] }}</a></div>
      
      </div>
    </div>
  </div>
</div>