Drupal 8 introduced a new hook in update system called post_update hook.

This session will cover:

What is an update system in Drupal?
What is an update hook?
What is a post_update hook?
How post-update hooks are different from update hooks?
When to use the update hooks?
When to use the post-update hooks?
How can we improve the update system?
About the speaker @jibran

Has been working with Drupal for more than 7 years.
Has more than 300 commit mentions in Drupal 8.
Has reviewed a lot Drupal 8 patches.
Is the maintainer of Contact and Shortcuts modules in core.
Is the maintainer of several contrib modules for Drupal 7 and Drupal 8.