UPDATE May 2017: Layout plugin is no longer required from Drupal 8.3 and onwards. Just install Layout Discovery which comes with Drupal core.
If you ever need to modify content pages, Display Suite is a good choice. It offers a lot of flexibility without learning a brand new interface. You just use the standard "Manage display" page to select a layout and move fields into regions.
I presented a webinar on how to use Display Suite in Drupal 8. The webinar went for around 50 minutes and I cover the following:
What's new in Drupal 8
How to set up a Display Suite layout on a view mode
How to change the wrapper elements
How to add custom CSS classes
How to use Display Suite fields
How to use the "Display Suite Switch View Mode" sub-module
And finally, how to override a layout.
Watch video Webinar: Customize Content Pages using Display Suite in Drupal 8 online without registration, duration hours minute second in high quality. This video was added by user WebWash 25 January 2017, don't forget to share it with your friends and acquaintances, it has been viewed on our site 9,334 once and liked it 82 people.