diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 3f5323572..77f1c88ec 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -289,9 +289,9 @@ Books on general-purpose programming that don't focus on a specific language are
 
 ### Arduino
 
-* [Ardiuno Projects Book](https://www.eitkw.com/wp-content/uploads/2020/03/Arduino_Projects_Book.pdf) - Scott Fitzgerald and Michael Shiloh (PDF)
 * [Arduino-docs : A beginner's guide](https://arduino-doc.readthedocs.io/en/latest/) - Paramesh Chandra (HTML)
 * [Arduino Programming Notebook](https://unglue.it/work/152452) - Brian Evans (PDF) (:card_file_box: *archived at unglue.it*)
+* [Arduino Projects Book](https://www.eitkw.com/wp-content/uploads/2020/03/Arduino_Projects_Book.pdf) - Scott Fitzgerald and Michael Shiloh (PDF)
 * [Arduino Tips, Tricks, and Techniques](https://cdn-learn.adafruit.com/downloads/pdf/arduino-tips-tricks-and-techniques.pdf) - lady ada (PDF)
 * [Getting started with Arduino – A Beginner’s Guide](http://manuals.makeuseof.com.s3.amazonaws.com/for-mobile/Arduino_-_MakeUseOf.com.pdf) - Brad Kendall (PDF)
 * [Getting Started with Arduino products](https://www.arduino.cc/en/Guide) - Official Arduino Documentation (:construction: *in process*)
@@ -504,7 +504,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Threading in C#](http://www.albahari.com/threading/)
 * [Xamarin Community Toolkit Succinctly](https://www.syncfusion.com/succinctly-free-ebooks/xamarin-community-toolkit-succinctly) - Alessandro Del Sole
 * [Xamarin.Forms for macOS Succinctly](https://www.syncfusion.com/ebooks/xamarin_forms_for_mac_os_succinctly) - Alessandro Del Sole
-* [Xamarin.Forms Notes for professionals](https://books.goalkicker.com/XamarinFormsBook/) - Compiled from StackOverflow documentaion (PDF)
+* [Xamarin.Forms Notes for professionals](https://books.goalkicker.com/XamarinFormsBook/) - Compiled from StackOverflow documentation (PDF)
 * [Xamarin.Forms Succinctly](https://www.syncfusion.com/ebooks/xamarin-forms-succinctly) - Alessandro Del Sole