Lesson 1/100

Tutorials Angular Tutorial

Introduction to Angular

Introduction to Angular: free step-by-step lesson with examples, common mistakes, and interview tips — part of Angular Tutorial on Toolliyo Academy.

8 min read Updated 7/21/2026

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Angular Tutorial · Lesson 1 of 100

Introduction to Angular

Setup & Components → Routing HTTP Rx → State & Perf → Ship & Projects

Setup & Components · 1 — UI · ~6 min · Setup

What is this?

Angular is a TypeScript framework for building single-page apps with components, routing, and dependency injection. AngularVerse is this course’s sample product — dashboards and admin UIs.

Why should you care?

Teams pick Angular for structured enterprise frontends with strong typing and a batteries-included toolchain (CLI, router, forms, HTTP).

See it live — copy this example

Run examples in an Angular CLI project (ng serve). Prefer standalone components and TypeScript strict mode.

// Mental model
// App -> Routes -> Standalone Components -> Templates + Services
console.log('AngularVerse: start with ng new, then one component at a time');

What happened?

You compose UI from components.
Services hold shared logic.
The router swaps views without full page reloads.

Practice next

Install Node LTS if needed.
Skim angular.dev docs home.
Write one sentence: what app will you build?
List three screens for AngularVerse.
Note Angular version you install.

Remember

Angular = components + DI + CLI. TypeScript is the default language. Build thin vertical slices.

Why Angular here

Bank wants a maintainable admin SPA.

Outcome: You can explain Angular’s fit in plain English.

Interview prep for this lesson

Practice these questions aloud after reading—each links to a full structured answer.

Junior PDF Detailed

What is Angular, and how is it different from AngularJS?

ngular is a TypeScript-based open-source front-end web application framework developed by Google for building single-page applications (SPAs). Key Differences: Feature AngularJS (v1.x) Angular (2+) Language JavaScript Ty…

Mid PDF Detailed

Create a feature module with routing:?

ng generate module admin --route admin --module app.module What interviewers expect A clear definition tied to Angular in Angular projects Trade-offs (performance, maintainability, security, cost) When you would and woul…

Junior PDF Detailed

How do you test Angular components? ● Use Angular’s TestBed to create a testing module that declares the component. ● Instantiate the component and its template for testing. ● Test component logic, DOM rendering, event handling, and bindings. ● Use Angular testing utilities like fixture.detectChanges() to update the view. Basic example: beforeEach(async () => {

wait TestBed.configureTestingModule({ declarations: [MyComponent] }).compileComponents(); fixture = TestBed.createComponent(MyComponent); component = fixture.componentInstance; fixture.detectChanges(); }); it('should cre…

Junior PDF Detailed

What is change detection in Angular? Change detection is the mechanism Angular uses to update the DOM when the

pplication's state changes. When data-bound properties change, Angular runs a change detection cycle to check if the view needs updating. It checks component data and updates the UI accordingly. Happens automatically aft…

Junior PDF Detailed

What is the Angular CLI, and how do you use it to create Angular applications?

The Angular CLI (Command Line Interface) is a tool to generate, build, test, and maintain Angular apps efficiently. It automates repetitive tasks and enforces best practices. You can create a new Angular app with: ng new…

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