"Home page" design
What the home page of the site will look like
"Single page design"
this is just what a "general" page looks like
It will usually be 3/4 width for the page content + 1/4 width for a sidebar.
We should also be able to use this for all "about us", services, and contact pages.
"Single blog post" design (what a single blog post or article looks like)
This layout will look a lot like a single page, but it may have social sharing buttons and a comments section added to the page.
"Archive page" design
What the home page for blog posts looks like
Then... a "Full width page" can also be useful for the site.
This essentially is like the "single page" above, but without the sidebar.
These layouts are good for like "Sales", "Special Announcements", or even questioners.