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.

Yesterday, I presented a webinar on how to use Display Suite in Drupal 8. The webinar went for around 50 minutes and I covered the following:
1. What's new in Drupal 8. 2. How to set up a Display Suite layout on a view mode. 3. How to change the wrapper elements. 4. How to add custom CSS classes. 5. How to use Display Suite fields. 6. How to use the "Display Suite Switch View Mode" sub-module. 7. And finally, how to override a layout.