Does angular server and flask server have both to be running at the same?
Angular does not need a server. It's a client-side framework so it can be served by any server like Flask. Probably in most tutorials, the backend is served by nodejs, not Flask.
I'm new to both angular and flask framework so plz be patient with me.
I'm trying to build a web app with flask as a backend server and Angular for the frontend (I didn't start it yet), and while gathering infos and looking at tutorials and some documentation (a little bit) I'm wondering: 
Does Angular server and flask server need both to be running at the same time or will just flask be enough? Knowing that I want to send data from the server to the frontend to display and collecting data from users and sending it to the backend. 
I noticed some guys building the angular app and using the dist files but I don't exactly know how that works.
So can you guys suggest what should I have to do or how to proceed with this?
Thank you ^^