diff --git a/books/free-programming-books-hi.md b/books/free-programming-books-hi.md
index 37834e386..a98c446a4 100644
--- a/books/free-programming-books-hi.md
+++ b/books/free-programming-books-hi.md
@@ -68,7 +68,7 @@
 * [PHP Tutorials In Hindi](https://www.learnhindituts.com/php) - LearnHindiTuts.com
 
 
-### python
+### Python
 
 * [Python Notes \| Hindi](https://ehindistudy.com/2022/10/12/python-pdf-notes-hindi/) - Yugal Joshi (HTML) *( :construction: in process)*
 * [Python Tutorial in Hindi (Full Python Course) \| Hindi](https://www.tutorialinhindi.com/wp-content/uploads/2022/01/Python-Tutorial-in-Hindi-Full-Python-Course-FREE-PDF.pdf) - TutorialInHindi.com (PDF)
diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index a3905cfaf..32fd58865 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -310,7 +310,7 @@ Books on general-purpose programming that don't focus on a specific language are
 ### ASP.NET
 
 * [Architecting Modern Web Applications with ASP.NET Core and Microsoft Azure (2020)](https://aka.ms/webappebook) - Steve "ardalis" Smith (PDF) *( :construction: in process)*
-* [ASP.NET MVC Music Store](http://mvcmusicstore.codeplex.com)
+* [ASP.NET MVC Music Store](https://learn.microsoft.com/en-us/aspnet/mvc/overview/older-versions/mvc-music-store/mvc-music-store-part-1)
 * [ASP.NET WebHooks Succinctly](https://www.syncfusion.com/ebooks/aspnet_webhooks_succinctly) - Gaurav Arora
 * [ASP.NET with C# (2008)](http://www.vijaymukhi.com/documents/books/vsnet/content.htm) - Vijay Mukhi, Sonal Mukhi, Neha Kotecha
 * [Diving into ASP.NET WebAPI (2016)](https://github.com/akhilmittal/FreeBooks/) - Akhil Mittal (PDF)
diff --git a/books/free-programming-books-subjects.md b/books/free-programming-books-subjects.md
index bce310da4..979a3dd07 100644
--- a/books/free-programming-books-subjects.md
+++ b/books/free-programming-books-subjects.md
@@ -472,6 +472,7 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Practical Deep Learning for Coders](https://course.fast.ai) - fast.ai
 * [Practitioners guide to MLOps](https://services.google.com/fh/files/misc/practitioners_guide_to_mlops_whitepaper.pdf) - Khalid Samala, Jarek Kazmierczak, Donna Schut (PDF)
 * [Probabilistic Machine Learning - An Introduction](https://github.com/probml/pml-book/releases/latest/download/book1.pdf) - Kevin P. Murphy (PDF)
+* [Probabilistic Machine Learning: Advanced Topics](https://probml.github.io/pml-book/book2.html) - Kevin P. Murphy (PDF)
 * [Python Machine Learning Projects](https://www.digitalocean.com/community/books/python-machine-learning-projects-a-digitalocean-ebook) - Lisa Tagliaferri, Brian Boucheron, Michelle Morales, Ellie Birkbeck, Alvin Wan (PDF, EPUB, Kindle)
 * [Reinforcement Learning: An Introduction](http://incompleteideas.net/book/RLbook2020.pdf) - Richard S. Sutton, Andrew G. Barto (PDF) (CC BY-NC-ND)
 * [Speech and Language Processing (3rd Edition Draft)](https://web.stanford.edu/~jurafsky/slp3/ed3book.pdf) - Daniel Jurafsky, James H. Martin (PDF)
@@ -938,6 +939,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [OWASP Top 10 for .NET Developers](https://www.troyhunt.com/2011/12/free-ebook-owasp-top-10-for-net.html)
 * [Practical Cryptography for Developer](https://cryptobook.nakov.com) - Svetlin Nakov (GitBook) ( :construction: *in process*)
 * [Programming Differential Privacy](https://programming-dp.com) - Joseph Near, Chiké Abuah (HTML, PDF)
+* [SecOps Bit By Bit: Roadmap for First-Time CTOs and Startup Founders](https://leanpub.com/secops-bit-by-bit) - Alex Yarotsky (PDF) *(Leanpub account or valid email requested)*
 * [Security Engineering](https://www.cl.cam.ac.uk/~rja14/book.html)
 * [Security Essentials](https://learning.lpi.org/en/learning-materials/020-100/) -  by Linux Professional Institute (PDF)
 * [The Joy of Cryptography (2021)](https://joyofcryptography.com/pdf/book.pdf) - Mike Rosulek (PDF)