Drupal 9 is here, and there are already some useful modules available for the newest stable version.Currently, for Drupal 9, there is Admin Toolbar, Redirect, Paragraphs, Metatag, Simple XML Sitemap, Field Group, Ctools, Entity Browser, Embed, Webform, Entity API, IMCE, Google Analytics, External Links, XML Sitemap, Focal Point, Acquia Connector, and the list appears to be growing. When searching for modules using the "Stable Release" filter, it seems that Drupal 9 is indeed forward compatible with Drupal 8!
IEEE Computer Society Search for author Darrell Ulm, research papers are shown for IEEE Computer Society Articles by Darrell R. Ulm. Tumblr , Wordpress