Angular 9

1. Ivy Renderer: Enhanced rendering engine for improved performance and smaller bundle sizes.
2. Faster Builds: Improvements in the compiler and runtime result in faster builds.
3. Internationalization (i18n) Enhancements: Easier localization of Angular applications for multiple languages.
4. Lazy Loading: Support for lazy loading of components for more efficient module loading.

Before learning Angular 9, it's beneficial to have the following skills:

1. HTML/CSS: Understanding of HTML and CSS for building web interfaces.
2. JavaScript/TypeScript: Proficiency in JavaScript, and preferably TypeScript, which is the primary language used in Angular development.
3. Web Development Basics: Knowledge of web development concepts like DOM manipulation, AJAX, and HTTP requests.
4. Version Control: Familiarity with version control systems like Git for managing code changes.

By learning Angular 9, you gain the following skills:

1. Modern Web Development: Ability to build modern, dynamic web applications using Angular 9.
2. Component-Based Architecture: Proficiency in developing applications using Angular's component-based architecture.
3. TypeScript: Mastery of TypeScript, which is the primary language used in Angular development.
4. Angular CLI: Expertise in using Angular CLI for project scaffolding, code generation, and development workflow.