\documentclass{book}
\usepackage{blindtext}
\usepackage{hyperref}
\hypersetup{
colorlinks=true,
linkcolor=blue,
filecolor=magenta,
urlcolor=cyan,
pdftitle={Overleaf Example},
pdfpagemode=FullScreen,
}
\urlstyle{same}
\begin{document}
\tableofcontents
\chapter{First Chapter}
This will be an empty chapter and I will put some text here
\begin{equation}
\label{eq:1}
\sum_{i=0}^{\infty} a_i x^i
\end{equation}
The equation \ref{eq:1} shows a sum that is divergent. This formula will be later used on page \pageref{second}.
For further references see \href{http://www.overleaf.com}{Something Linky} or go to the next url: \url{http://www.overleaf.com} or open the next file \href{run:./file.txt}{File.txt}
It's also possible to link directly any word or \hyperlink{thesentence}{any sentence} in your document.
If you read this text, you will get no information. Really? Is there no information?
For instance \hypertarget{thesentence}{this sentence}.
\Blindtext
\clearpage
\section{Second section} \label{second}
\blindtext
\Blinddocument
\end{document}
