Drupal Create Bootstrap 5 Subtheme

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Below steps are tested with Drupal 9 and bootstrap 5.

Step 1: Install Bootstrap 5 theme

Step 2: Click on Appearance

Step 3: Click on installed Bootstrap 5 theme Settings

Drupal 9 Create Bootstrap 5 Subtheme

Step 4: Navigate to Subtheme section and set subtheme location, subtheme name and subtheme machine name

Drupal 10 Create Bootstrap 5 Subtheme

Step 5: Click on Create

Your subtheme is ready, check in Appearence section.

To override page.html.twig copy from location templates/layout folder and create similar directory structure.