info about free ebook

README.md

@@ -37,22 +37,12 @@ Your generosity fuels my passion for creating more insightful content for you.
 
 If you have any improvement ideas or a topic to write about, feel free to prepare a pull request or just let me know.
 
-## Ebook - The Foundation of Successful Software Engineering: A Practical Guide to Testing Best Practices
-
-After the success of this guide, I’ve started thinking about writing an ebook about a broader practical guide to testing best practices:
-
-- Undervalued Test Driven Development (TDD)
-- Unit tests
-- Integration tests
-- Modularity and tests
-- Contract testing
-- Behavior-Driven Development (BDD)
-- A lot of practical examples
-- Only necessary theory → as simple as possible
-
-Firstly I would like to validate this idea. So I hope that you will be able to help me with this. 
-If you are interested in this ebook, have a look at:   
-:point_right: [Details](https://sarvendev.com/ebook-practical-guide-to-testing-best-practices/)
+## Free ebook – Unit testing tips
+
+[![FreeEbookUnitTestingTips](./assets/ebook-unit-testing-tips.png ':size=300')](https://sarvendev.com/free-ebook-unit-testing-tips/)
+
+Subscribe and master unit testing with my FREE eBook! 🚀    
+:point_right: [Details](https://sarvendev.com/free-ebook-unit-testing-tips/)
 
 I still have a pretty long TODO list of improvements to this guide about Unit Testing and I will introduce them in the near future.