Normally when we discuss cut, copy, and paste, we talk about putting text on a clipboard. In Vim's terminology, we don't deal with a clipboard but instead with register.
Transposing Characters
cuts the character under the cursor, placing a copy of it in the unnamed register.
pastes the contents of the unnamed register after the cursor position.
Transpose the next two characters.
Transposing Lines
cuts the current line, placing it into the unnamed register.
pastes the contents of the unnamed register after the current line.
Transpose the order of this line and its successor.
Duplicating Lines
duplicates current line. Does a line-wise copy and paste.
Oops! I Clobbered My Yank
paste the contents of our unnamed register in front of the cursor.
in this case, overwrite the contents of the unnamed register.
