In the main folder we can see these folders and files.
assets/ A public folder that includes the assets from the packages, third party libraries, and media files that we upload.
log/ A private folder that save logs and the user sessions.
tmp/ A public folder with temporally files created.
src/ The folder of installed packages. Here is all the code of the system.
sites/ A folder that we can add more websites that share the same installation.
themes/ The folder of installed themes.
index.php The main index file. For any call, execution starts from here.
config.php The configuration file. It is generated after installation.