history object: 1. The history object is a property of the window object. It has a single property name length. 
2. The history object contains the URLs visited by the user (within a browser window).

functions: 1. back() - Loads the previous URL in the history list.
2. forward() - Loads the next URL in the history list.
3. go() - Loads a specific URL from the history list.

Cookie:
1. A cookie is usually a small piece of data sent from a website and stored in a user's web browser while a user is browsing a website. 
2. When the user browses the same website in the future, the data stored in the cookie can be retrieved by the website to notify the website of the user's previous activity.
3. Cookies were designed to be a reliable mechanism for websites to remember the state of the website or activity the user had taken in the past

The general format for setting a cookie is this:

document.cookie=value;[expires];[path];[domain];[secure];

1. Reserved words are those in JavaScript that have been reserved for statements and bulit-in functions. 
2. We should avoid creating identifier for variable and functions that are identical to JavaScript reserved word.

Five reserved words are:

1. function
2. for
3. return
4. break
5. continue

An Interpreted Language: The process involves by browser parsing (interpreting) the JavaScript code and then creating an equivalent machine language and execute the interpreted code.

Loosely typed language: The language that does not require to specify the datatype (int, float, boolean, string etc.) before declaring variables. 

Function: 

1. A colloection of statements/code which can perform a specific task and can be executed by an event of call to that function. 
2. We can have a) Built-in function and 2) User-defined functions

Syntax of defining a function:

function functionName(functionParameter list){
 
   statements

}

Example:

function add(a,b){
   return a+b;
}