This is one of the most important tutorials.
Learn this: when you copy and paste text from another site, to include on your own site, do NOT simply paste the text into an editing area. IT WILL NOT WORK.
Each template is set up with specific fonts that make the site harmonious. If you paste text from another site into these areas, you will have a bad looking site.
Below is an example: I copied the text from a site I had on another hosting service. Notice the white areas? That is part of the html code I copied from my former website.
(Click on the image for full size)
Click the pencil icon to open the editor.
Then, click "Paste as Plain Text" to add text from another website
Paste your text HERE. Then click "Insert"
Save the block. Now look at our text: the white lines have vanished.
Now it is a simple matter or formatting the text the way you like it, and everything will turn out beautifully. Your font and formatting are now a pleasant fit, not a hodge-podge of various stray HTML codes.