Angular project and server files on localhost
Root directory if it is one or two files - like configs etc. 
If you actually need a server side app maybe it's better to make that the root project and have angular in a view folder.
ng serve command runs a server instance on a localhost. I would like to use some server-side scripts on the same localhost and communicate between angular app and the http server.
I have some issue by not knowing in which directory I should place Python scripts. So that I can run extend the functionality of Angular app, to gather data from localhost server?
EDIT:
I am visiting http://localhost:4200/data.php in a browser, but I am always getting a 304 redirect. I figure this could be due to incorrect placing of php files. I've put it in src, ..src and app folder, but nothing seem to work.