diff --git a/pl/kt/docs/courses.txt b/pl/kt/docs/courses.txt
index a29c65ec2..64e5079c8 100644
--- a/pl/kt/docs/courses.txt
+++ b/pl/kt/docs/courses.txt
@@ -21,6 +21,8 @@ FPMI - Kotlin Scientific Programming ru
     https://www.youtube.com/playlist?list=PL4_hYwCyhAvZzRpbK4iTy9S6_OWZNEiVk
 Dudar - Kotlin for Beginners
     https://www.youtube.com/playlist?list=PL0lO_mIqDDFUP-pEWtX7mrnmoP4Hxxp6y
+2020
+https://www.linkedin.com/learning/kotlin-essential-training
 2019
 Udemy - Kotlin for Beginners Learn Programming With Kotlin
     https://paidcoursesforfree.com/kotlin-for-beginners-learn-programming-with-kotlin/
diff --git a/pl/kt/docs/resources.txt b/pl/kt/docs/resources.txt
index 6b83e4e85..b81fa13e9 100644
--- a/pl/kt/docs/resources.txt
+++ b/pl/kt/docs/resources.txt
@@ -1,4 +1,46 @@
 https://t.me/kotlin_lib
 
+
 https://kotlinlang.org/docs/resources.html
 https://github.com/tunjos/lean-kotlin
+
+https://www.kotlinprimer.com/introduction/maintainability/
+
+2025
+https://hackr.io/blog/how-to-learn-kotlin
+2022
+https://www.techrepublic.com/article/programming-languages-how-to-learn-kotlin-with-these-resources-for-developers/
+2018
+https://superkotlin.com/kotlin-mega-tutorial/
+2017
+Being More Productive With Kotlin 0:00 of 36:23
+    https://www.youtube.com/watch?v=PGcKgtlmLvA
+DerekBanas - Kotlin Tutorial 0:00 of 1:26:23
+    https://www.youtube.com/watch?v=H_oGi8uuDpA
+    https://www.newthinktank.com/2017/05/kotlin-tutorial/
+Devoxx - 10 Kotlin Tricks in 10 ish minutes by Jake Wharton 0:00 of 17:23
+    https://www.youtube.com/watch?v=0sPzDwS55wM
+2016
+VoxxedDaysTicino - You can do better with Kotlin by Svetlana Isakova 0:00 of 51:29
+    https://www.youtube.com/watch?v=bVuhlusXdZ4
+Keks - KT in Real Projects 0:00 of 1:30:36
+    https://www.youtube.com/watch?v=lpPbCWpBM3I
+https://www.youtube.com/watch?v=klakgWp1KWg
+https://kotlin.link/articles/Scala-vs-Kotlin.html
+????
+https://kotlin.link/
+https://superkotlin.com/resources-learn-kotlin/
+    examples ...
+https://blog.kotlin-academy.com/error-handling-the-kotlin-way-7e2fb31b1aff
+https://fabiomsr.github.io/from-java-to-kotlin/
+https://play.kotlinlang.org/koans/overview
+https://github.com/amitshekhariitbhu/from-java-to-kotlin
+https://blog.kotlin-academy.com/
+
+cheatsheet
+https://blog.kotlin-academy.com/kotlin-cheat-sheet-1137588c75a
+
+android
+https://developer.android.com/kotlin
+https://developer.android.com/samples/?language=kotlin
+https://www.youtube.com/watch?v=1LPWp3EntWc