diff --git a/01_Day_Introduction/day1/datatypes.js b/01_Day_Introduction/day1/datatypes.js
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+//5. Create datatypes.js file and use the JavaScript typeof operator to check different data types. Check the data type of each variable
+console.log(typeof Name)
+console.log(typeof human)
+console.log(typeof x)
+console.log(typeof Null)
+//6. Declare four variables without assigning values
+let a
+let b
+let c
+let d
+//7. Declare four variables without assigning values
+const one = 1
+const two = 2
+const three = 3
+const four = 4
+//8. Declare variables to store your first name, last name, marital status, country and age in multiple lines
+let FirstName = "kevin"
+let LastName = "H"
+let MaritalStatus = "single"
+let country = "USA"
+let age = 24
diff --git a/01_Day_Introduction/day1/helloworld.js b/01_Day_Introduction/day1/helloworld.js
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+console.log("Hello, World!")
+//1. Write a single line comment which says, comments can make code readable
+//comments can make code readable
+
+//2. Write another single comment which says, Welcome to 30DaysOfJavaScript
+//Welcome to 30DaysOfjavaScript
+
+//3. Write a multiline comment which says, comments can make code readable, easy to reuse and informative
+/*comments can make code Readable,
+easy to reuse and informative*/
\ No newline at end of file
diff --git a/01_Day_Introduction/day1/index.html b/01_Day_Introduction/day1/index.html
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+
+
+
+ Multiple External Scripts
+
+
+ //
+
+
+
+
+
+
\ No newline at end of file
diff --git a/01_Day_Introduction/day1/introduction.js b/01_Day_Introduction/day1/introduction.js
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+++ b/01_Day_Introduction/day1/introduction.js
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+console.log('Welcome to 30DaysOfJavaScript')
\ No newline at end of file
diff --git a/01_Day_Introduction/day1/variable.js b/01_Day_Introduction/day1/variable.js
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+++ b/01_Day_Introduction/day1/variable.js
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+//4. Create a variable.js file and declare variables and assign string, boolean, undefined and null data types
+let Name = "kevin"
+let human = true
+let x
+let Null = null
+
+//9.Declare variables to store your first name, last name, marital status, country and age in a single line
+let FirstName1 = "kevin", LastName1 = "H", MaritalStatus1 = "single", country1 = "USA", age1 = 24
+
+//10.Declare two variables myAge and yourAge and assign them initial values and log to the browser console.
+let myAge = 24
+let yourAge = 21
+console.log(myAge,yourAge)