I found an article that has answered a lot of terms that have been floating around me since I have adopted Drupal as my new career.  It has clarified a great many things that I only had passing understanding and I wish to share it here.

The roles it clarifies are:

Found a fix for the Scroll/Modal problems I was having with using Bootstrap with Layout Builder. In Bootstrap issue https://www.drupal.org/project/bootstrap/issues/2821008 #23 it tells us to Uncheck the 'Enable Bootstrap Modals' box. in the theme.

$view = new view();
$view->name = 'homepage';
$view->description = 'Emulates the default Drupal front page; you may set the default home page path to this view to make it your front page.';
$view->tag = 'default';
$view->base_table = 'node';
$view->human_name = 'homepage';
$view->core = 0;
$view->api_version = '3.0';

# screen -R

# =============================================================== #
#
# PERSONAL $HOME/.bashrc FILE for bash-3.0 (or later)
# By Emmanuel Rouat [no-email]
#
# Last modified: Tue Nov 20 22:04:47 CET 2012

<div style=" width:100%; height:299px; overflow: auto; overflow-y: scroll; max-width:100%; max-height:300px;" >

<div style="width:100%;height:300px;line-height:3em;overflow:auto;padding:5px;">

<style type="text/css">/* unvisited link */
a:link {
  color: green;
}

/* visited link */
a:visited {
  color: green;
}

/* mouse over link */
a:hover {
  color: red;
}

/* selected link */
a:active {
  color: yellow;
}</style>