Functions:Defining and invoking functions, parameters and arguments, return values, anonymous functions, arrow functions.
Scope:Global, local, and block scope.
Arrays:Creating and manipulating arrays, common array methods.
Objects:Creating objects, properties and methods, this keyword, object-oriented programming (OOP) concepts (encapsulation, inheritance, polymorphism) with JavaScript classes and prototypes.
Error Handling:Try-catch blocks, throwing and handling errors.