Manage Updates using WordPress Toolkit – cPanel

Login to cPanel.
Tutorial: login from the Client Area or the direct link.

Find the Domains section and click the WordPress Toolkit link.
or
In the search bar at the Top, type WordPress Toolkit and click on the result.

First, Check updates link.
Update all plugins, themes, and WordPress installations if needed.

Secondly, check Autoupdate settings.

Change this option in whatever suits your needs:
Update WordPress automatically
Choose between: No; Yes, but only minor updates; Yes, all updates
Update plugins automatically
Choose between: Defined individually or Forced
Update themes automatically
Choose between: Defined individually or Forced
Once finished, click the OK button.

Thirdly, check the Smart Update option.
Turn Smart Update on by toggling on the switch next to Smart Update as pictured below.

Smart Update is a feature that allows you to test updates to your website, its plugins and themes without actually affecting the website itself.
This feature will clone the website, run all of the updates on the clone, then run a number of checks against the updated website to see if the updates caused any issues.
All going well, the results of the changes made to the clone will be made available to you as the owner of the website. And you can make an educated guess as to whether or not you want to push the updated version of the website to the live website.