Labeling in Latex

In LaTeX you can easily reference almost anything that is numbered (sections, figures, formulas), and LaTeX will take care of numbering, updating it whenever necessary. The commands to be used do not depend on what you are referencing.

ch     : chapter
sec    : section
subsec : subsection
fig    : figure
tab    : table
eq     : equation
lst    : code listing
itm    : enumerated list item
alg    : algorithm
app    : appendix subsection

\begin{figure}[H]  
\begin{center}   
\includegraphics[width=0.9\textwidth]{01_chapters/01/figs/exsample.jpg}  
\end{center}  
\caption{Image Caption}  
\label{fig:figure1} 
\end{figure}   

The figure can reference as figure \ref{fig:figure1} in the page \pageref{fig:figure1}