As the title suggests I want to start off with Arabic section counting and continue with alphabetic for the source codes. It should look somewhat like the following. 
Currently, I achieve this by renewing the section command as follows:
\renewcommand\thesection{\Alph{section}}
\setcounter{section}{0}
But this results in a problem with the hyperlinks. If I no click on A Source Code: Gridworld Environment, it navigates to the Introduction. Somehow the hyperlinks are messed up, and I don't know how to fix it.
\appendix. – campa Dec 24 '20 at 15:44\appendix\section{Source Code foo} foo \section{Source code bar} bar. – CampanIgnis Dec 24 '20 at 15:45