diff --git a/README.md b/README.md
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+++ b/README.md
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 # javascript-references
-Material to reference when working with JavaScript 
+
+Material to reference when working with JavaScript
diff --git a/hello-world/README.md b/hello-world/README.md
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+# Hello World in JavaScript
+
+A set of scripts that output the message "Hello World". Such a program is very simple in most programming languages, and is often used to illustrate the basic syntax of a programming language. See https://en.wikipedia.org/wiki/%22Hello,_World!%22_program
diff --git a/hello-world/index.js b/hello-world/index.js
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+++ b/hello-world/index.js
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+/**
+ * No need to "use strict"
+ * In this case even though we are not declaring this code as an ES6 module
+ * the following code contains no syntax that can be caught by strict mode.
+ * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode
+ * See ./varDeclaration.js for an example that can benefit from strict mode.
+ */
+
+/**
+ * The Console object provides access to the browser's debugging console
+ * See https://developer.mozilla.org/en-US/docs/Web/API/console
+ * The Console object's methods include log()
+ * The Console method log() outputs a message to the console.
+ * The message is not limited to a single string.
+ * See https://developer.mozilla.org/en-US/docs/Web/API/Console/log
+ */
+console.log("Hello World");
+
+/**
+ * The easiest way to test this file is to run the following line in your console:
+ * node index.js
+ */
diff --git a/hello-world/varDeclaration.js b/hello-world/varDeclaration.js
new file mode 100644
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+++ b/hello-world/varDeclaration.js
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+/**
+ * "use strict" in this case
+ * We are not declaring this code as an ES6 module and the following code
+ * contains syntax that can be caught by strict mode.
+ * See ./index.js for an example that does not benefit from strict mode.
+ */
+"use strict";
+
+/**
+ * The code below will declare a global string named helloWorld,
+ * this is valid ES5 code, in ES6 we can also use let or const.
+ * Normally in ES6 this would be declared as a const.
+ * See ./es6.js for an example using const.
+ */
+var helloWorld = "Hello World";
+
+/**
+ * Strict mode will catch an undeclared variable i.e:
+ * helloWorld = "Hello World"
+ * The above commented line will throw an error in strict mode.
+ */
+
+/**
+ * The Console object provides access to the browser's debugging console
+ * See https://developer.mozilla.org/en-US/docs/Web/API/console
+ * The Console object's methods include log()
+ * The Console method log() outputs a message to the console.
+ * The message is not limited to a single string.
+ * See https://developer.mozilla.org/en-US/docs/Web/API/Console/log
+ */
+console.log(helloWorld);
+
+/**
+ * The easiest way to test this file is to run the following line in your console:
+ * node varDeclaration.js
+ */
diff --git a/hello-world/varExport.js b/hello-world/varExport.js
new file mode 100644
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+++ b/hello-world/varExport.js
@@ -0,0 +1,35 @@
+/**
+ * Do not include "use strict"
+ * In this case we are declaring this code as an ES6 module,
+ * module code is always strict mode code.
+ * See http://www.ecma-international.org/ecma-262/6.0/#sec-strict-mode-code
+ * See ./varDeclaration.js for an example that is not in strict mode by default.
+ */
+
+/**
+ * The code below will declare and export a string constant named helloWorld,
+ * this is valid ES6 code, in ES5 we can only use var.
+ * See ./varDeclaration.js for an example using var.
+ */
+export const helloWorld = "Hello World";
+
+/**
+ * Strict mode will catch an undeclared variable i.e:
+ * helloWorld = "Hello World"
+ * The above commented line will throw an error in strict mode.
+ */
+
+/**
+ * The Console object provides access to the browser's debugging console
+ * See https://developer.mozilla.org/en-US/docs/Web/API/console
+ * The Console object's methods include log()
+ * The Console method log() outputs a message to the console.
+ * The message is not limited to a single string.
+ * See https://developer.mozilla.org/en-US/docs/Web/API/Console/log
+ */
+console.log(helloWorld);
+
+/**
+ * The easiest way to test this file is to run the following line in your console
+ * nodemon varDeclaration.js
+ */
diff --git a/hello-world/varImport.js b/hello-world/varImport.js
new file mode 100644
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+++ b/hello-world/varImport.js
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+/**
+ * Do not include "use strict"
+ * In this case we are declaring this code as an ES6 module,
+ * module code is always strict mode code.
+ * See http://www.ecma-international.org/ecma-262/6.0/#sec-strict-mode-code
+ * See ./varDeclaration.js for an example that is not in strict mode by default.
+ */
+
+/**
+ * The code below will declare and import a string constant named helloWorld.
+ * See ./varExport.js
+ */
+import { helloWorld } from "./varExport";
+
+/**
+ * The Console object provides access to the browser's debugging console
+ * See https://developer.mozilla.org/en-US/docs/Web/API/console
+ * The Console object's methods include log()
+ * The Console method log() outputs a message to the console.
+ * The message is not limited to a single string.
+ * See https://developer.mozilla.org/en-US/docs/Web/API/Console/log
+ */
+console.log(helloWorld);
+
+/**
+ * The easiest way to test this file is to run the following line in your console:
+ * nodemon varDeclaration.js
+ */