First we will add a Basic Page. Click "Content"

Click "Menu settings" in the right hand toolbar. 

Click the Parent Link dropdown and put under "Demo". 

<Main navigation>
-- Home (disabled)
-- Demo

Tip! Nesting a menu item under an existing menu item will give you the dropdown menu on the front end. 

Here we just create basic content for our page. 

Here is our page nested under "Demo". Now we will add a block. Click "Structure".

Choose Section Block to get design layouts as you'd see on Basic Page. 

For training, I will add a random name- but the purpose of block description is to be descriptive about the purpose of the block. 

As an example, we will just add 3 columns to this block. 

Pantheonsite

In this tutorial we will learn create a basic page and add a context to that page. 

Exercise 1: Creating a Basic Page and a Block