Update README.md

Author: rubada

README.md

@@ -7,4 +7,6 @@ To learn more about this course, please check below course contents, all the vid
 
 [2. Learn Python Professionally. PART-1. Python Basics. General](https://www.youtube.com/playlist?list=PLD06In0ejHWZgqOs0jbUprDt6Yi_FFQ4l)
 
-[2. Learn Python Professionally. PART-1. Python Basics. Strings](https://www.youtube.com/playlist?list=PLD06In0ejHWZmkDw8Zx5R6T3vN2kidkXw)
+[3. Learn Python Professionally. PART-1. Python Basics. Strings](https://www.youtube.com/playlist?list=PLD06In0ejHWZmkDw8Zx5R6T3vN2kidkXw)
+
+[4. Learn Python Professionally. PART-1. Python Basics. Booleans and Operators.](https://www.youtube.com/playlist?list=PLD06In0ejHWZ9EiZ5HlMcfnWulhDNe0Iu)