Custom page layouts
Did you know that WordPress page layouts can be altered on a per-page basis? That is, you can have one page which is a full width page, while other pages may have a left sidebar, and still others may have a right sidebar.
Why would you want to change the appearance of your pages? When you create a landing page, you'll want to eliminate any sidebar distractions - so that's one page you'd like to have show only full width content.
AdSense warning
Google takes a dim view of it's AdSense ads appearing on your 404 error page or several other non-content pages - see https://support.google.com/adsense/answer/1346295#... for more. In cases like these, you need to avoid showing sidebars that may have AdSense ads in them, and you can make that happen with full width content pages.
Mix it up
Similarly, you can alter the appearance of your site by showing the right sidebar with certain pictures, your blogroll, or site indexes on most pages, and put different text and pictures in your left sidebar, to be displayed on certain other pages.
Take a look at your admin area and experiment a bit with your site - you can always change things back to their original layout if you don't like the results of your trial.
Play with it!
Dennis
But
When you use the full page template this creates a problem with the smaller mobile devices and so not really as mobile friendly as google likes and it will penalize you for this.
Full Page Layout is fine for a text only article if you don't mind scrolling but who is going to read a full page of text on a mobile phone these days, and especially if they have to scroll back and forth and up and down?
People want to see a pic or image description of what they're reading about. otherwise it gets boring in a very short time and people will click away.
Nice training demo and you have a nice day.
Robert