• 2-1: Installation typescript, nvm & ts-node-dev
• 2-2: TypeScript has two types of typing: implicit and explicit.
• 2-3: Array and tuples in typescript
• 2-4: Object, Literal Types, and Optional things
• 2-5: Spread, Rest, Default Parameters, and Destructuring
• 2-6: Type alias and optional types
• 2-7: Union, Intersection, and Enum Types
• 2-8: Nullable, Unknown, & Never Types
• 2-9: Ternary Operator, Nullish Coeslancing Operator, keyof operator