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The basic arithmetic operations are addition, subtraction, multiplication, and division.

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Alert gives you a pop up info box and document.write writes to the webpage.

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Alert shows an alert box to the user with a message that the user has to press "Ok" to continue using the website.

The document.write prints something directly to the website and don't require user interaction.

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A variable is a “named storage” for data. We can use variables to store  visitors, and other data.

You can assign a value to a variable using equal to (=) operator when you declare it or before using it.

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A variable is a location of memory that can contain a data value.
eg
var y = 6

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Arithmetic operators include;

+ (Addition),

- (Subtraction),

* (Multiplication),

/ (Division),

% (Modulus),

++ (Increment),

- - (Decrement).

Comparison operators include;

== (Equal),

!= (Not equal),

< (Less than),

<= (Less than or equal),

> (Greater than),

>= (Greater than or equal).

Logical operators include;

&& (Logical "and" evaluates to true when both operands are true),

|| (Logical "or" evaluates to true when either operand is true),

! (Logical "not" evaluates to true if the operand is false).

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Variable means anything the can vary. Javacript includes variable which holds the data value and it can be changed anytime. A variable must have a unique name.

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for a single line comment use - // text //
for multi line comment use - /* text */

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A variable holds data that can be changed.
Eg: var a =10

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A variable refers to something that can hold a data value that can be changed when required (a memory location)
eg : var x = 5;

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List
Arithmetic operators
Assignment operators
Comparison and logical operators

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Explain the difference between Alert and document.write

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How do you add a comment

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Explain a variable and give an eg
List few things you need to remember when defining variables

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Lesson 1
Assigning and declaring variables and applying operators in a script