diff --git a/courses.php b/courses.php
index c3157ad..0f7de61 100644
--- a/courses.php
+++ b/courses.php
@@ -22,6 +22,27 @@ include "includes/navbar.html";
 ?>
 </header>
 <section class="teaching">
+<article>
+  <header>
+    <h1>Gasal 2020/2021</h1>
+  </header>
+  <ol>
+    <li><a href="kakom-ti/index.php">Computer Security</a></li>
+    <li><a href="adminsis-ti/index.php">System Administration</a></li>
+    <li><a href="os-ti/index.php">Operating System</a></li>
+  </ol>
+</article>
+<article>
+  <header>
+    <h1>Genap 2019/2020</h1>
+  </header>
+  <ol>
+    <li>Computer Security</li>
+    <li>System Administration</li>
+    <li>Operating System</li>
+    <li>Computer Network</li>
+  </ol>
+</article>
 <article>
   <header>
     <h1>Gasal 2019/2020</h1>
diff --git a/index.php b/index.php
index 503de1f..2b7d87d 100644
--- a/index.php
+++ b/index.php
@@ -30,7 +30,7 @@ include "includes/quotes.php";
 
 <section class="biography">
 <header>Short Biography</header>
-<p>Willy Sudiarto Raharjo obtained his Bachelor Degree and Master degree in Computer Science from <a href="http://www.ukdw.ac.id/">Duta Wacana Christian University</a> in 2005 and <a href="http://www.ugm.ac.id/">Gadjah Mada University</a> in 2009. His main research includes Computer Security, Cryptography, and Software Engineering. His main operating system is <a href="http://www.slackware.com/">Slackware Linux</a>, so you can see nice tux sitting on top of this site.</p>
+<p>Willy Sudiarto Raharjo obtained his Bachelor Degree and Master degree in Computer Science from <a href="http://www.ukdw.ac.id/">Duta Wacana Christian University</a> in 2005 and <a href="http://www.ugm.ac.id/">Gadjah Mada University</a> in 2009. His main interests includes Cloud Computing, Computer Security, and Cryptography. He is selected to become AWS Cloud Ambassador in 2020. His main operating system is <a href="http://www.slackware.com/">Slackware Linux</a>, so you can see nice tux sitting on top of this site.</p>
 </section>
 </section>
 
@@ -50,9 +50,9 @@ include "includes/quotes.php";
   <article>
     <header>
       <h3>My classes next semester</h3>
-      <span><time datetime="2019-08-20">August 20, 2019</time></span>
+      <span><time datetime="2020-08-06">August 06, 2020</time></span>
     </header>
-    <p>I will be teaching  Operating System, System Administration, and Computer Security.</p>
+    <p>I will be teaching  Operating System, System Administration, Business Communication, and Computer Security.</p>
   </article>
 </section>
 <?php
diff --git a/kakom-ti/index.php b/kakom-ti/index.php
index dac8d2a..eb776c9 100644
--- a/kakom-ti/index.php
+++ b/kakom-ti/index.php
@@ -25,7 +25,7 @@ include "../includes/courses.php";
   </header>
   <aside>
     <p>
-	Grup A<br/>Hari Kamis<br/>Jam 10:30 - 13:20
+	Grup A<br/>Hari Selasa<br/>Jam 13:30 - 15:00
 	</p>
   </aside>
 </section>
@@ -51,18 +51,16 @@ include "../includes/courses.php";
   <ol>
     <li>Syllabus</li>
     <li>Introduction to Security</li>
-    <li>People, Operational, and Organizational Security</li>
-    <li>Access Control Models</li>
+    <li>Security Principles</li>
     <li>Access Control Mechanism (Authentication)</li>
     <li>Access Control Mechanism (Authorization)</li>
     <li>Personal Security</li>
     <li>Malware</li>
-    <li>Secure Software Development</li>
-    <li>Low Level Attacks</li>
-    <li>Web Concepts</li>
+    <li>Control hijacking attacks</li>
+    <li>Isolation and sandboxing</li>
     <li>Web Security</li>
     <li>Network Security</li>
-    <li>Wireless Security</li>
+    <li>Cryptography</li>
   </ol>
 </section>
 <section class="references">
diff --git a/os-ti/index.php b/os-ti/index.php
index e209d4d..cb91327 100644
--- a/os-ti/index.php
+++ b/os-ti/index.php
@@ -24,8 +24,7 @@ include "../includes/courses.php";
     <h3>Jadwal</h3>
   </header>
   <aside>
-    <p>Grup A<br/>Hari Kamis<br/>Jam 07.30 - 16.20</p>
-	<p>Grup C<br/>Hari Rabu<br/>Jam 13.30 - 16.20</p>
+    <p>Grup D<br/>Hari Kamis<br/>Jam 13.30 - 15.00</p>	
   </aside>
 </section>
 <section class="classinfo">
@@ -33,7 +32,7 @@ include "../includes/courses.php";
     <header>
       <h1>PEMBERITAHUAN</h1>
     </header>
-    <p>Bagi yang hendak mengambil matakuliah ini, Anda <strong>diwajibkan memiliki akun Moodle.</strong></p>
+    <p>Bagi yang hendak mengambil matakuliah ini, Anda <strong>diwajibkan memiliki akun Moodle</strong> dan mendaftarkan diri pada platform <a href="https://aws.amazon.com/education/awseducate/">AWS Educate</a> melalui link yang tersedia.</strong></p>
   </section>
   <section class="description">
     <header>
@@ -59,10 +58,7 @@ include "../includes/courses.php";
     <li>Virtual Memory</li>
     <li>Mass-Storage Structure</li>
     <li>File System</li>
-    <li>Input/Output System</li>
     <li>Virtual Machines</li>
-    <li>Special Topic</li>
-    <li>Presentation/Review</li>
   </ol>
 </section>
 <section class="references">