1. the theory of knowledge, especially with regard to its methods, validity, and scope, and the distinction between justified belief and opinion.

primitive type  datatype are as follows  

1. number 
2. String
3. Boolean
4. Null
5. Undefined
6. Symbol
7. BigInt

do not confuse yourself with primitive values example 

typeof 42 , returns "Number" but typeof new Number(32) returns Object

The typeof operator is unary { which means it only take one argument}  and inform us of the type of data indicated as a given argument.   

the argument can be either a literal or a variable. 

All possible return values of the typeof operator are:

"undefined" "object" "boolean" "number" "bigint" "string" "symbol" "function"

. String interpolation is a process of substituting values of variables into placeholders in a string1

// C# example

string name = "Alice";

int age = 25;

Console.WriteLine($"Hello, {name}. You are {age} years old.");

// Output: Hello, Alice. You are 25 years old.

in javascript 

In JavaScript, literals represent fixed values that you provide directly in your code. These values are not variables; they are constants that you literally write into your script. 

example of Object literals 

const person = {

    name: "Alice",

    age: 30,

    isStudent: false

};

Type conversion in JavaScript refers to changing the data type of a value from one type to another.

here good example :

let y = "5"; // y is a string

let x = +y; // x is a number  -- > you will get a NaN 

String(x); // returns a string from a number variable x

String(123); // returns a string from a number literal 123

String(100 + 23); // returns a string from an expression

correct will be Number(y) will return numeric value.