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The first one, Ctrl+'H' is mis-labeled. It doesn't show/hide type, it shows/hides the type highlighting that indicates when a range of type has been selected.

The second and third shortcuts actually go together, and are only relevant when you have created a text box in the type layer by clicking and dragging out a rectangle before entering type, which enables Photoshop to automatically wrap text into multi-line paragraphs. At that point, the line-by-line editing and previous/next paragraph should become obvious.

Hope this helps!

Madster