change color latex code example

Example 1: tex color text

\usepackage{xcolor}
\begin{document}

This is a sample text in black.
\textcolor{blue}{This is a sample text in blue.}

\end{document}

Example 2: latex coloured text

\textcolor{red}{
}

Example 3: change the color of the description of a url latex

\documentclass{article}
\usepackage{xcolor}
\usepackage[colorlinks = true,
            linkcolor = blue,
            urlcolor  = blue,
            citecolor = blue,
            anchorcolor = blue]{hyperref}

\newcommand{\MYhref}[3][blue]{\href{#2}{\color{#1}{#3}}}%

\begin{document}
Here is \MYhref{http://www.google.com}{Google} and \MYhref{http://www.yahoo.com}{Yahoo!}.

Here is \MYhref[brown]{http://www.google.com}{Google} and \MYhref[red]{http://www.yahoo.com}{Yahoo!}.
\end{document}