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If you have a parenthetical point to get across that's not as "important" as your main content, the "Discreet" style makes a good choice.
Did you know that the "Pull-quote" style can be applied to a paragraph to make it look like this?
The test default "Paragraph Style" is used for all main paragraphs on the page. In general, it's a good idea to break up large ideas into smaller chunks when writing and styling content for the web.
What about links? If you add a link in your paragraph, avoid simply saying "click here" since this provides no context of where the link goes to someone who is quickly scanning the page. A better approach would be to make the link text descriptive like this: Return to IT Homepage.
By the way, this is the "discreet" style again!
When you have several points to get across that are part of a larger idea, use the subheading style to name each one. Bullet points are also useful to:

When you place an image on a page in plone, you'll see that the "caption" checkbox defaults to being ON now. The caption that will automatically display under the image is the "description" that's added to the image when it's uploaded. If you would like a specific caption for an image, just let IT know when we upload the image and we'll add it to the description so it shows up.
You set the right/left/inline option when you place the image on your page. Make a mistake? Just delete the image from the page and replace it the way you want.
You can embed videos on any page. Read about embedding videos and other assets.