Drupal's security advisory has announced the patches to fix 2 moderate and 2 less critical vulnerabilities in Drupal 7x and 8x versions. One of the moderately critical vulnerability patch is related to DoS loop holes. Its highly recommended to update your Drupal site to respective 7.52 and 8.2.3. Notably Drupal 8.2.3 includes only security patches.
I completed "Acquia Certified Drupal 8 Site Builder" exam with overall score of 76%. Certification focuses mainly on 8 sections covering various aspects of Drupal 8 site building. Certification had 50 question to be answered in 75 Minutes and 68% as a passing mark.
I cleared Acquia Certification for Drupal 8 Foundations with overall score of 75%, not a great score though. Certification focuses mainly on 3 section - Site Building, Frond end Development and Back-end Development. Certification had 40 question to be answered in 1 hours and 65% as a passing mark.
Whenever we try deleting any content Drupal displays a confirmation page. Through this Confirmation page Drupal handles CSRF. Cross site request forgery is an attach which enforces an end user to perform some operation without his intend.