What are the interaction methods between Angular 2 and Express?

Question

JavaScript

Hello, I created a server on NodeJs, express. Everything is stored in the server folder (server/app.js) , then I created a folder and an application in Angular (ng new client). How can you link them?
On react, I did a bunch through webpack and webpack-dev-middleware. After starting the server, the client itself was launched and interacted with the api. With angular how to do this correctly? I'm a beginner, don't scold me much, I googled and they do it differently everywhere, I even prescribed statics but nothing ..



app.js

app.use(express.static(path.join(__dirname, '/../client/src')));

A window opens and the inscription "Loading ..."
If you run ng server in a separate terminal, the site will work. Do I need to run the server and client separately on different ports?