diff --git a/helloworld.js b/helloworld.js
new file mode 100644
index 0000000..b8d48d2
--- /dev/null
+++ b/helloworld.js
@@ -0,0 +1 @@
+console.log("Hello, World!!");
diff --git a/index.html b/index.html
index 23827a5..6c02505 100644
--- a/index.html
+++ b/index.html
@@ -14,5 +14,7 @@
     </script>
 
     <script src="./introduction.js"></script>
+    <script src="./helloworld.js"></script>
+    <script src="./solutions/day-01/level1.js"></script>
   </body>
 </html>
diff --git a/introduction.js b/introduction.js
index e69de29..dd7b367 100644
--- a/introduction.js
+++ b/introduction.js
@@ -0,0 +1 @@
+console.log("Welcome to 30DaysOfJavaScript");
diff --git a/solutions/day-01/level1.js b/solutions/day-01/level1.js
index d3f5a12..e7e4347 100644
--- a/solutions/day-01/level1.js
+++ b/solutions/day-01/level1.js
@@ -1 +1,64 @@
+// Exercise - Level 1
 
+const arr = Array();
+console.log(arr);
+
+const numbers = [1, 2, 3, 4, 5];
+
+firstNumber = numbers[0];
+middleNumber = numbers[2];
+lastNumber = numbers[4];
+
+console.log(firstNumber, middleNumber, lastNumber);
+
+const mixedDataTypes = ["CSS", 2, "books", "HTML", 5, 9];
+
+console.log(mixedDataTypes.length);
+
+let itCompanies = [
+  "facebook",
+  "Google",
+  "Microsoft",
+  "Apple",
+  "IBM",
+  "Oracle",
+  "Amazon",
+];
+
+console.log(itCompanies);
+console.log(itCompanies.length);
+console.log(itCompanies[0], itCompanies[3], itCompanies[6]);
+
+console.log(itCompanies.slice());
+
+for (const company of itCompanies) {
+  console.log(company.toUpperCase());
+}
+
+console.log(itCompanies.join(", "));
+
+console.log(itCompanies.includes("Apple"));
+
+const index = itCompanies.find((company) => company.includes("oo"));
+console.log(index);
+
+itCompanies.sort();
+console.log(itCompanies);
+
+itCompanies.reverse();
+console.log(itCompanies);
+
+console.log(itCompanies.slice(0, 3));
+console.log(itCompanies.slice(4, 7));
+console.log(itCompanies.slice(3, 4));
+
+itCompanies.shift();
+console.log(itCompanies);
+
+itCompanies.splice(2, 1);
+console.log(itCompanies);
+
+itCompanies.pop();
+console.log(itCompanies);
+
+console.log(itCompanies.splice());