mychapter.tex

\section{My Chapter} %remove the * if you want headers with number
This is some text without color\\\\
\textcolor{blue}{\textbf{This is some text with color}}\\\\
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% let us define a color
\definecolor{myorange}{RGB}{255,127,0}
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% and now use it
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\begin{tcolorbox}[width=\columnwidth, enhanced, sharp corners, title=box title, colframe=myorange]
This is a fancy box.
\end{tcolorbox}
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% maybe we need this box more than once so let us make a reusable macro
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\newcommand{\mybox}[1] { % one argument, we can take more where necessary
	\begin{tcolorbox}[width=\columnwidth, enhanced, sharp corners, title=box title, colframe=myorange]
		#1 
	\end{tcolorbox}
}
% #1 will be replaced with the first parameter 
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\mybox{This is also a fancy box}
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% Hint: put macro definitions in the .sty file to avoid confusion
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\subsection{My Subsection}
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\begin{tabular}{| p{0.2\columnwidth} | p{0.7\columnwidth} |}
	\hline
	foo     & this is a column          \\ \hline
	bar     & with newline \newline we can have multi-line columns \\ \hline
\end{tabular}
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