Mysterious text boxes

I am sure I pressed something on the keyboard by accident, and I hope someone can explain to me how to make text boxes look normal again.

On one page in my forthcoming book, when I click on any text box there, a dashed box appears around it, as if it's been grouped.  I've just now discovered that a solid-line box appears around each LINE of type, and there is no way to edit the type line (not that I want to, but the cursor doesn't even show).

I can retype everything, because there isn't much on the page, but:

     what does all of this mean?

     how did I get there?  (I love keystroke commands, btw) and

     is there a way to get rid of all of this?

Thanks!