How to create a username from an email address using AngularFire2's email/password authentication method
Tips & Tricks, Angular, Bootstrap
How to install Boostrap 4-beta in Angular 4 as a dependency, not with a CDN.
Free (or almost free) list of Angular resources.
Angular, TypeScript, Tips & Tricks
Simple example of how to use *ngIf in Angular 2+
Typescript and Babel environment setup.