Is it possible to convert a Beamer presentation to Google Slides format? I spent some time looking for a solution here and elsewhere without much luck, but perhaps I missed something.
[Tex/LaTex] Converting a Beamer Presentation to Google Slides
beamerconversion
Related Solutions
You could define your own if condition and just wrap every additional slide inside of \ifadditional ... \fi.
\documentclass{beamer}
\newif\ifadditional
\additionaltrue
%\additionalfalse % UNCOMMENT TO CREATE SMALLER VERSION
\begin{document}
\frame{Frame 1}
\ifadditional
\frame{Frame 2 -- Additional Slide}
\fi
\frame{Frame 3}
\end{document}
A poster is a different way of organizing information compared to a slide show, so there is no easy conversion. You need to rethink your layout, illustrations, and wording (imho your beamer presentation has far too much text, by the way).
That said, the template you picked (Jacobs Landscape Poster, http://www.latextemplates.com/template/jacobs-landscape-poster) is rather straightforward to use - just insert your own code into the template. A beamer frame becomes a poster block, and that's about it. Minimal non-working example:
\title{Categorification of Higman's Lemma\\Admits Applicability and Constructive Proof} % Poster title
\author{Julian Rachman} % Author(s)
\institute{West High School} % Institution(s)
[...]
\begin{alertblock}{Abstract}
Higman's Lemma, a special case of Kruskal's Tree Theorem, provides fascinating results in the areas of combinatorics, logic, and theoretical computer science. [...]
\end{alertblock}
\begin{block}{Introduction}
Higman's Lemma is concerned with the preservation of well-quasi-orderedness over the construction of ordered algebraic structures. It was first introduced by Higman in his main theorem concerned with abstract algebras equipped with quasi-orders and later became an important statement in combinatorics and theoretical computer science where it was narrowed down to the following concise theorem:
\end{block}
\begin{theorem}[Highman's Lemma]
If $\leqslant$ is a \textit{wqo} on $A$, then $\preccurlyeq$ is a \textit{wqo} on $A^*$.
\end{theorem}
[...]
Result:
For future questions, please try first if you can find a solution yourself, and if you encounter problems, post them as a question (e.g., 'I tried to put a theorem on my poster, this is the code, the result is such, but I would like it to be different').
Best Answer
It's not exactly doable because of a fundamental mismatch in LaTeX's design and what Google Slides (and other mainstream presentation software wants). Export beamer slides to powerpoint/openoffice-impress/keynote editable format is probably your best best for a solution—I'm pretty sure that Google Slides can import powerpoint and the solutions at the linked question can at least get you part of the way there.