\documentclass{beamer}
\usepackage[utf8]{inputenc}
\usepackage{polski}
\usepackage{times}
\usepackage[T1]{fontenc}
\usepackage{default}
\usepackage{tikz}
\usetheme{CambridgeUS}
\title[Short Paper Title] % (optional, use only with long paper titles)
{Mój tytuł prezentacji}

\subtitle
{by ćwiczyć beamer'a} % (optional)

\author[Author, Another] % (optional, use only with lots of authors)
{K.~Krzywda\inst{1} \and S.~Wymyślony-Współautor\inst{2}}
\AtBeginSubsection[]
{
\begin{frame}<beamer>{Outline}
\tableofcontents[currentsection,currentsubsection]
\end{frame}
}


\begin{document}
	
	
\begin{frame}
\titlepage
\end{frame}

\begin{frame}{Outline}
\tableofcontents
% You might wish to add the option [pausesections]
\end{frame}


\begin{frame}{slajd informacyjny}
\end{frame}

\begin{frame}{slajd nr 2}
\begin{itemize}
	\item using the \texttt{pause} command:
	\begin{itemize}
		\item
		First item.
		\pause
		\item    
		Second item.
	\end{itemize}
	\item
	using overlay specifications:
	\begin{itemize}
		\item<3->
		First item.
		\item<4->
		Second item.
	\end{itemize}
	\item
	using the general \texttt{uncover} command:
	\begin{itemize}
		\uncover<5->{\item
			First item.}
		\uncover<6->{\item
			Second item.}
	\end{itemize}
\end{itemize}

\end{frame}

\begin{frame}{Make Titles Informative.}

You can create overlays\dots

\end{frame}



\end{document}