Keyboard shortcut for new paragraph in note

Sorry for the newbie question but I can't find this answer anywhere.

How do I create a new paragraph without having to click in a different part of the page?  By paragraph I am referring to the boxed area that I can type in.  If I click on a blank page, it creates this paragraph.  When I click in another part of the page, it creates another boxed paragraph.  How do I do that using only the keyboard? 

Further, how do I specify if I want the next box/paragraph to the right or below?  When I use the mouse, it always takes some adjustment to get it to line up where I want it (unless my click is dead on). Is there a keyboard shortcut to nudge it up/down/left/right?

Thank you.