Passo a passo para configurar o Bootstrap e o Font Awesome no Angular

ng-bootstrap-conf.md

Terminal:

ng new my-project --style=scss
cd my-project
npm install --save bootstrap@4.0.0-alpha.6 @ng-bootstrap/ng-bootstrap font-awesome
ng serve

Em src/styles.scss, adicionar:

@import '~bootstrap/dist/css/bootstrap.min.css';
@import '~font-awesome/css/font-awesome.css';

Em src/app/app.module.ts, adicionar:

import { NgbModule } from '@ng-bootstrap/ng-bootstrap';

@NgModule({
  //...
  imports: [
    //...
    NgbModule.forRoot(),
    //...
  ],
  //...
})
//...

Referência do ng-bootstrap para substituir o que o Bootstrap implementa com JS (bootstrap.js e jQuery).