Test out things and play here. No need to worry about breaking anything!  To get started, click on EDIT above the word Sandbox above.  You'll see a page with an editing area and a formatting "ribbon" with the basic word processing features.

This is a header - choose Format > Heading 1 to make it look like OR this...

And here is heading 2

That over to the left is a table, with the middle cell set to have

a background color. Pretty spiffy. Also, the text is bigger -- choose Size > 130% to make it look like this.