The very basic idea you need to know is how to add sections. Any page in your site is built from "stripes" - horizontal sections that come in a huge variety of designs, layouts and structures.
1. To add a Stripe, hover between sections and click the "Plus" button
2. Choose the section that fits you the most.
You can browse through the different types of sections from the upper sections' category-list.
3. Click the section & add it to your page
4. Viola - it's been added.
TIP: You can easily delete any section, replace it with another, move it up or down, or change its height. See step #3.