No matter what type of WordPress site you are setting up, every WordPress blog has some structural things in common. One of those is the way the pages/posts are set up visually. WordPress has the main part of the content on every page or post in the main part of the page, while there is also a sidebar on the right or left of the page with standard inserts.
Before I go on, let me preface my information by saying although this is the usual way a WordPress site is set up, with some themes, you can do away with the sidebar completely, have more than one sidebar, or have the sidebar on the bottom. However the jist of the information that I will give you here will not change.
To understand how a WordPress page or post is set up visually, here is a post from Writing Online:
For this website, we have chosen to put the main content on the left of each page. For English readers, or readers from any language that is read from left to right, it is natural to start on the left side of the page. That means that you should put your most important content, pictures or information on the top left side of a page. (For this discussion pages and posts are the same because they appear the same visually to the public.) For Writing Online the most important information is the page content, which might not be true on another site.
Our sidebar is on the right side of the page which lists the search bar, login space, ads, and feed from our other sites. This set up was a deliberate choice for our readers made by us taking into consideration the data of how people view a page on the internet.
So what do you want to include in your content which will appear on the main part of the page?
Content should be what includes your keywords, your main topic, what the search engines will find and what your readers will read. If you have Adsense on your site, Adsense will also put ads on that match the content on your page.
What goes in the sidebar?
The sidebar on a WordPress site is populated by widgets. Widgets can be may different things, but I usually include featured posts, ads, and a search bar, and sometimes a directory of how the site is set up. While you do not want to overwhelm your pages with ads, remember that ads near the top will get clicked on the most.
Over time, I have found that the simplest looking WordPress sites are usually the best, because people do not get distracted by anything that will stop them from reading, clicking and buying from you. My best sites are the ones with either a black, gray, or white background, and very little distractions from the content. As I update my sites, that is what I am changing them all to, because they load faster, and they get a better response from readers.