Updated free-courses-id.md (#3783)

* Update free-courses-id.md

Added recourse(s)

* Fixed Formatiing

I hope

free-courses-id.md

 ### Index
 
 * [Android](#android)
+* [C / C++](#c--c)
 * [Dart](#dart)
 * [Docker](#docker)
 * [Flutter](#flutter)
@@ -12,6 +13,7 @@
   * [Vue](#vue)
 * [Kotlin](#kotlin)
 * [Kubernetes](#kubernetes)
+* [Linux](#Linux)
 * [MongoDB](#mongodb)
 * [PHP](#php)
   * [Laravel](#laravel)
@@ -25,6 +27,13 @@
 * [Tutorial Android (Kotlin)](https://www.youtube.com/playlist?list=PLaoF-xhnnrRUEbF6cvk4-CeBAEOSbp8sS) - EDMT Dev
 
 
+### C / C++
+
+* [Bahasa C dengan Dev-C++](https://www.youtube.com/playlist?list=PLZNiz_sFO6tdZ_DcLhtbxLboLlpuqpzLC) - H.I Edukasi
+* [Belajar C++ - Object Oriented Programming Bahasa Indonesia (OOP)](https://www.youtube.com/playlist?list=PLZS-MHyEIRo7-RC_-hkL9gu0_ofABw862) - Kelas Terbuka
+* [Belajar C++ Bahasa Indonesia (Dasar)](https://www.youtube.com/playlist?list=PLZS-MHyEIRo4Ze0bbGB1WKBSNMPzi-eWI) - Kelas Terbuka
+
+
 ### Dart
 
 * [Pemrograman Berorientasi Objek - Dart](https://www.youtube.com/playlist?list=PLZS-MHyEIRo7cgStrKAMhgnOT66z2qKz1) - Erico Darmawan Handoyo
@@ -38,6 +47,7 @@
 ### Flutter
 
 * [Flutter Tutorial (Flutter Fundamentals)](https://www.youtube.com/playlist?list=PLZQbl9Jhl-VACm40h5t6QMDB92WlopQmV) - Erico Darmawan Handoyo
+* [Tutorial Flutter](https://www.youtube.com/playlist?list=PL0-7Xi0GB3teRqkuBusUEcVrP6OlYpD9w) - idr corner
 
 
 ### Go
@@ -100,6 +110,12 @@
 * [Belajar Kubernetes untuk Pemula](https://www.youtube.com/playlist?list=PL-CtdCApEFH8XrWyQAyRd6d_CKwxD8Ime) - Programmer Zaman Now
 
 
+### Linux
+
+* [Linux Pemula](https://www.youtube.com/playlist?list=PLACzo3mGgHK_D2wkGu4AvUAQiqLC30PTz) - LINUXcare
+* [Tutorial Terminal Linux Bahasa Indonesia](https://www.youtube.com/playlist?list=PLy1BHEa_Wr-cpjWY5uOqsMxQwiQrRnC8B) - ArtAway
+
+
 ### MongoDB
 
 * [Belajar MongoDB](https://www.youtube.com/playlist?list=PL-CtdCApEFH-eFFdPeS5e16o3THdmvxvz) - Programmer Zaman Now