diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 12d93b8a2..974794c81 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -174,6 +174,7 @@ Books on general-purpose programming that don't focus on a specific language are
     * [Django](#django)
     * [Flask](#flask)
     * [Kivy](#kivy)
+    * [Numpy](#numpy)
     * [Pandas](#pandas)
     * [PyOpenCl](#pyopencl)
     * [Pyramid](#pyramid)
@@ -1980,7 +1981,6 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Dive into Python 3](https://diveintopython3.problemsolving.io) - Mark Pilgrim (3.0)
     * [Dive into Python](https://linux.die.net/diveintopython/html/toc/index.html) - Mark Pilgrim (2.3)
 * [Essential Python](https://www.programming-books.io/essential/python/) - Krzysztof Kowalczyk, StackOverflow Contributors
-* [From Python to NumPy](https://www.labri.fr/perso/nrougier/from-python-to-numpy/) - Nicolas P. Rougier (3.6)
 * [Full Stack Python](https://www.fullstackpython.com) - Matt Makai
 * [Functional Programming in Python](https://www.oreilly.com/ideas/functional-programming-in-python) - David Mertz  
 * [Fundamentals of  Python Programming](https://web.archive.org/web/20191005170430/http://python.cs.southern.edu/pythonbook/pythonbook.pdf) - Richard L. Halterman (PDF) *(:construction: in process)*
@@ -2128,6 +2128,13 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Kivy Programming Guide](https://kivy.org/docs/guide-index.html)
 
 
+#### NumPY
+
+* [From Python to NumPy](https://www.labri.fr/perso/nrougier/from-python-to-numpy/) - Nicolas P. Rougier (HTML) (3.6)
+* [Guide to NumPY 2010](https://web.mit.edu/dvp/Public/numpybook.pdf) - Travis E. Oliphant (PDF).
+* [NumPy user guide](https://numpy.org/doc/stable/user) - NumPY developers (HTML).
+
+
 #### Pandas
 
 * [Best Pandas Tutorial \| Learn with 50 Examples](https://www.listendata.com/2017/12/python-pandas-tutorial.html) - Ekta Aggarwal (HTML)
diff --git a/courses/free-courses-en.md b/courses/free-courses-en.md
index 9b1361b54..c2dbe9546 100644
--- a/courses/free-courses-en.md
+++ b/courses/free-courses-en.md
@@ -1233,6 +1233,7 @@
 ### Kotlin
 
 * [Advanced Android with Kotlin](https://www.udacity.com/course/advanced-android-with-kotlin--ud940) (Udacity)
+* [Android Development Full Tutorial 2023 \| Kotlin](https://www.youtube.com/watch?v=9-pFPGAOSZQ) - Scaler
 * [Android Kotlin Tutorial: Create Android Apps using Kotlin](https://www.youtube.com/playlist?list=PLlxmoA0rQ-Lw5k_QCqVl3rsoJOnb_00UV) - Sriyank Siddhartha
 * [Android with kotlin](https://www.youtube.com/playlist?list=PLlxmoA0rQ-Lw5k_QCqVl3rsoJOnb_00UV) - Smartherd
 * [Developing Android Apps with Kotlin](https://www.udacity.com/course/developing-android-apps-with-kotlin--ud9012) (Udacity)