JavaScript for Modern Web Development: Building a Web Application Using HTML, CSS, and JavaScript

It matches only those elements matched by the second selector that are the children of elements matched by the first
It is stricter than a descendent selector where the element2 can be the child of element1 at any level of DOM.

The browser attaches the style to the associated DOM nodes and finally displays the contents of the DOM.

It is considered a good programming practice to add enough comments so anyone can understand your code just by looking at it with the supporting comments.

let rem= num1 % num2; // Modulus
num1++; // Post-increment
++num1; // Pre-increment
num1-- // Post-decrement
--num1 // Pre-decrement

2++; // Unary Operator
2 + 3; // Binary Operator
(4 > 3) ? true : false; //Ternary Operator

A function is a code block that is designed to work together to perform a specific task. The task to be done by the function is defined once and can be invoked or executed in the form of a function, a number of times.

for (initialization; test condition; updation) {
// … loop body …
}
Example : for(i=0;i<10;i++)
{
console.log(i);
}

They can be entry-controlled or exit-controlled depending on the placement of the loop condition

Iterative statements: Block of code getting executed for multiple numbers of times based on the loop condition.

switch case statements: Conditionally execute code based on the value match as shown: