Two terms you will encounter quite often when working with WBCE CMS are block and section. Actually the idea behind these is quite simple.
Have a look at the following example. In the main block (red border) there is a WYSIWYG section with text content. In the column on the right (green border) there is a tiny WYSIWYG section (yellow background) and another section with a contact form (cyan background) which was generated by the miniForm module.
Now have a look at the backend view of this page:
If you switch to the "manage sections" view, you can easily configure the position of the sections:
As you can see, there are some more input fields introduced here which will be explained later on.