I think the OP is asking how to move text to the beginning and end of a paragraph, like what Home/End do in Windows. On a Mac, there are two ways to do that:
The Classic Mac OS way:
⌘← : move to beginning of paragraph
⌘→ : move to end of paragraph
or, the emacs way, which I prefer, since it doesn't require moving your hands off the home row:
⌃A : move to beginning of paragraph
⌃E : move to end of paragraph