diff --git a/free-courses-id.md b/free-courses-id.md
index 004532dd03ddc8764932f98ea0c959e7c92ed15e..7e307ff3a0da4ff87b0aa8c89aff7aa9c187fa0b 100644
--- a/free-courses-id.md
+++ b/free-courses-id.md
@@ -1,12 +1,19 @@
 ### Index
 
+* [Go](#go)
 * [HTML / CSS](#html--css)
 * [Java](#java)
 * [JavaScript](#javascript)
+* [Kotlin](#kotlin)
 * [PHP](#php)
 * [Python](#python)
 
 
+### Go
+
+* [Belajar Go-Lang untuk Pemula](https://www.youtube.com/playlist?list=PL-CtdCApEFH_t5_dtCQZgWJqWF45WRgZw) - Programmer Zaman Now
+
+
 ### HTML / CSS
 
 * [Belajar FLEXBOX](https://www.youtube.com/playlist?list=PLFIM0718LjIU1lWlM34j6E9fMlrrSGZ1k) - Web Programming UNPAS
@@ -31,6 +38,15 @@
 * [JavaScript Lanjutan](https://www.youtube.com/playlist?list=PLFIM0718LjIUGpY8wmE41W7rTJo_3Y46-) - Web Programming UNPAS
 
 
+### Kotlin
+
+* [Belajar Kotlin Collection](https://www.youtube.com/playlist?list=PL-CtdCApEFH-aC-35fw5qrr6DZ-qMzmRr) - Programmer Zaman Now
+* [Belajar Kotlin Dasar untuk Pemula](https://www.youtube.com/playlist?list=PL-CtdCApEFH_hja5vRJgQOXylCiQud7Qa) - Programmer Zaman Now
+* [Belajar Kotlin Generic](https://www.youtube.com/playlist?list=PL-CtdCApEFH8MW630XLcNKsBDWCCdh2mR) - Programmer Zaman Now
+* [Belajar Kotlin Object Oriented Programming](https://www.youtube.com/playlist?list=PL-CtdCApEFH8lHOsi7kIDxK57WWLmzVog) - Programmer Zaman Now
+* [Belajar Kotlin Unit Test](https://www.youtube.com/playlist?list=PL-CtdCApEFH8HoTBUpYgQ-Q45U54Tn_up) - Programmer Zaman Now
+
+
 ### PHP
 
 * [Belajar PHP untuk PEMULA](https://www.youtube.com/playlist?list=PLFIM0718LjIUqXfmEIBE3-uzERZPh3vp6) - Web Programming UNPAS