Reusable blocks can be created and managed in Drupal 8 in the following steps:
1. Log in to Drupal 8 admin panel and navigate to the “Structure” section.
1. Click on the “Block layout” option to access the block management page.
1. Click on the “Custom blocks” tab and select “Add custom block” button.
1. Select the “Block layout” option to create a new reusable block.
1. Enter a title for the block and select the content type you want to use.
1. Type in the content for the block in the text editor.
1. Select the visibility settings for the block, including where it should be displayed.
1. Save the reusable block.
1. To use the reusable block on a page, navigate to the page and click on the “Add block” button.
1. Select the reusable block you created earlier and place it on the page.
1. The reusable block can now be used on any other pages or areas of the website by adding it as a block.
That’s it! You have now created and used reusable blocks on Drupal 8.
