Angular

• Routing
• Observable and Subject
• Communicating with the Server
• @ViewChild decorator
• Directives
• Content Projection / Transclusion
• Pipes
• Forms
• Barrels - Organize exports
• Lazily Loading Feature Modules

CSS

• CSS Methodologies
• Margin & Padding
• Display
• Selectors
• Width & Height

HTML

• Structural Elements
• Self Closing tags

JavaScript

• Web Workers
• script v script async v script defer
• Scope
• Data Types & Data Structures
• Hoisting
• Closure
• Type coerecion equations
• null v undefined
• == v ===
• Arrow functions / Fat arrow functions