How can I implement a twocolumn template

Question

How can I implement such template (two columns):

In my case additional panel can contain images.

Answer 1

It looks like you want a twosided document. In the MWE I have used

• the geometry package to set up the page dimensions
• the caption package to provide the captionof command, used in the margin figures
• the changepage package to give the extra width environment that you wanted.

I have also loaded the lipsum package for sample text, and the graphicx package to include images.

\documentclass[10pt,twoside]{report}
\usepackage[left=7cm,right=1cm,showframe=true,                  % page settings (showframe is useful!)
    top=1.5cm,bottom=1.5cm]{geometry}               
\usepackage[demo]{graphicx}
\usepackage{lipsum}
\usepackage{caption}
\usepackage{changepage}

\reversemarginpar

\begin{document}

\marginpar{
\centering 
\includegraphics[width=\marginparwidth]{myfig}
\captionof{figure}{My Figure}}
\lipsum

\lipsum

\marginpar{
\centering 
\includegraphics[width=\marginparwidth]{myfig}
\captionof{figure}{My Figure}}

\lipsum[1]

\begin{adjustwidth}{-7cm}{}
\lipsum[2]
\end{adjustwidth}

\end{document}

Note that you'll want to remove showframe=true from the geometry load, and [demo] from the graphicx load- these were just for demonstration.