After many googling, I found a lot of solutions for the automatic division of the content in multiple columns. For example, this.
But this is not what I want.
I want to create a multi-column latex side, that I specify, what will be the width and the content of the various columns. In the HTML world, I would likely use <div>s for the task.
Intuitively, I would like some similar:
\begin{multicol}
\begin{column}[12cm]
...content of the left column...
\end{column}
\begin{column}[9cm]
...content of the right column...
\end{column}
\end{multicol}
Can I somehow do that?
I think using matrices/tables for the task could work, however I experienced many problems with the creation of complex table cells.