AngularJS: JavaScript framework for dynamic web apps. Uses MVC pattern for code organization. Simplifies development with two-way data binding, directives, and dependency injection. Encourages component-based architecture and testability.

AngularJS directives enhance HTML, making it dynamic. Key built-in directives include ng-app, ng-model, ng-bind, and ng-init. Custom directives allow creating reusable components. Directives follow a compile-link lifecycle, enabling powerful, interactive web applications.

AngularJS data binding syncs UI and data effortlessly. One-way binding updates view from model, two-way binding allows bidirectional updates. Simplifies interactive web applications, reducing code complexity.

AngularJS controllers manage data and behavior, linking views with logic. They initialize data, respond to user actions, and organize application structure. Controllers work with services for complex operations, promoting modular and maintainable code.

$scope in AngularJS binds HTML and JavaScript, enabling two-way data binding. It's a JavaScript object holding model data and functions, crucial for seamless data flow between view and controller.

AngularJS expressions dynamically bind data to HTML, enabling interactive web pages. They display variables, perform calculations, work with objects/arrays, and call functions directly in markup, enhancing user experience.

AngularJS filters transform data in views without altering models. Built-in filters like uppercase, currency, and date simplify formatting. Custom filters offer more flexibility. Chaining filters enables powerful transformations, enhancing data presentation efficiently.

Angular forms simplify data collection with two-way binding, built-in validators, and custom validation. Real-time feedback enhances user experience, making form building efficient and user-friendly.

AngularJS events enable interactive web apps. Key events include ng-click, ng-change, and ng-submit. They handle user interactions, simplify code, and integrate with AngularJS's digest cycle for seamless data updates.

AngularJS Dependency Injection simplifies code by managing object creation. It enables modular, testable apps by injecting services into components, making development smoother and more efficient.

AngularJS services and factories organize code and share functionality. Services are singleton objects for data sharing, while factories offer flexibility in returning various value types. Both enhance code organization and testability.

AngularJS modules organize code into reusable components. They contain controllers, services, and directives. Modules can depend on other modules, promoting code organization and maintainability in web applications.

Angular routing enables seamless navigation in single-page applications. It uses paths, components, and states to define routes, supporting features like guards, parameters, and lazy loading for improved user experience.

AngularJS's $http service enables versatile HTTP requests. Inject it, use methods like get() and post(), handle promises with then(), customize with configuration objects, and encapsulate in services for cleaner code.

Custom directives extend markup functionality, acting like personal HTML elements or attributes. They enhance development by abstracting complex logic into reusable, focused components across various frameworks.

SPAs offer seamless, app-like web experiences. AngularJS revolutionized SPA development with features like two-way data binding and dynamic routing. SPAs improve user engagement but require consideration for SEO and initial load times.

Angular's built-in services like $timeout, $interval, and $location enhance web apps. They offer delayed execution, recurring tasks, and URL manipulation, integrating seamlessly with Angular's digest cycle for efficient updates and easy testing.

AngularJS animations bring web apps to life using ngAnimate module. CSS classes control transitions for elements entering, leaving, or moving. Animations can be customized with JavaScript and combined with third-party libraries for engaging user experiences.

AngularJS error handling: Tackle common issues like $rootScope:inprog, unknown providers, and compile errors. Use $timeout, proper dependency injection, promises, and $q service. Avoid infinite loops and syntax errors in expressions.

Building a to-do app teaches full-stack development basics. It involves data storage, server-side logic, and client-side rendering. Start simple, add features gradually, and test thoroughly for a solid learning experience.