Adding own website to existing OSMC web server

Can I use the existing web server of OSMC to install a Laravel website or is it better to install Apache or Nginx server instead ?

If yes, what files of the existing server should be configured ? (It seems to be using Lighttpd but I couldn’t find config files in /etc)

The “existing” web server of OSMC is actually an integrated part of KODI. So, no you can not use that and should install Apache and Nginx.

Just watchout not to overlap ports with the KODI webinterface.