How to use \newline after an item list?

Concretely, this is what I am trying to do:

\documentclass{article}

\begin{document}
\begin{itemize}
\item This
\item That
\item Where
\end{itemize}
%if I put \newline or \\ here it does not work. Why?
I am doing it here to test this.
\end{document}


Where the item list ends, I want to give some linespacing but neither \newline nor \\ is working. Why is that?

-
Are you trying to start a new paragraph? – Joseph Wright Mar 13 '14 at 19:58
I wonder also about that \setlength{\arrayrulewidth} - line. – Christian Hupfer Mar 13 '14 at 20:32
@ChristianH. not normal to use \par explicitly, a blank line is enough. – David Carlisle Mar 13 '14 at 20:55
If you don't want to start a new paragraph, maybe \\ at the end of the last item (before \end{itemize})? – cfr Mar 13 '14 at 21:43
@JosephWright, You can say that, yes. – user1343318 Mar 13 '14 at 21:44

Basically the problem is that \\ ends a line, but after an itemize there exist no line that can be ended.

Mi very simple solution to case like these is to put a "fake line" by adding a space and then the newline. This will be like:

\begin{itemize}
\item one
\item two
\end{itemize}
\  \\

-

The right way to add a "blank line" would be to insert some horizontal space.

Inserting \bigskip you have the corresponding space:

\begin{itemize}
\item This
\item That
\item Where
\end{itemize}
\bigskip
I am doing it here to test this.


If you also want to start a new (indented) paragraph add a blank line:

\begin{itemize}
\item This
\item That
\item Where
\end{itemize}
\bigskip

I am doing it here to test this.


MWE:

\documentclass{article}

\begin{document}
\begin{itemize}
\item This
\item That
\item Where
\end{itemize}
\bigskip
I am doing it here to test this.

\begin{itemize}
\item This
\item That
\item Where
\end{itemize}
\bigskip

I am doing it here to test this.
\end{document}


Output:

-

Here are some examples with explanations:

\documentclass{article}
\begin{document}
\begin{itemize}
\item This
\item That
\item Where
\end{itemize}
I am doing it here to test this.

\begin{itemize}
\item This
\item That
\item Where
\end{itemize}
Putting \verb|\newline| or \verb|\\| here will cause an error that there is no line here to break. This is because a new line has already been started by the ending of the list. Putting the same command here\\
will work because this is in the middle of a line.

\begin{itemize}
\item This
\item That
\item Where
\end{itemize}

One way to get extra horizontal space is to start a new paragraph.

\begin{itemize}
\item But you
\item may \emph{just}
\item want space\\
\end{itemize}
without a paragraph break.

\begin{itemize}
\item If you
\item want
\item a little\\[-.5em]
\end{itemize}
less space
\begin{itemize}
\item or you
\item want
\item a lot\\[5em]
\end{itemize}
more.

\end{document}


and the output:

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This produces underfull hboxes... – karlkoeller Mar 14 '14 at 6:14
@karlkoeller Is that bad? I mean they are warnings but you know in this case why you get the warnings and that you in fact want the space. In general, I interpret warnings as 'You may want to check... because normally you wouldn't want...' rather than necessarily demonstrating that there is a problem. (It is only a problem if you didn't want... - normally, but not always, the case.) – cfr Mar 14 '14 at 18:10