readme updated

Author: resolvingpython

README.md

@@ -2,13 +2,17 @@
 
 This repository contains the exercises you'll work during the course "Resolving Python for Analysis Data Visualization".
 
-You may use the exercises to practice on your own free of charge; challenges and datasets are provided.
+You may use the exercises to practice on your own; challenges and datasets are provided.
 
 Within every folder, you will find 2 types of Jupyter Notebooks:
 
-- A: Blank notebook to be completed with the explanations given in the [digital course](https://resolvingpython.gumroad.com/l/data-visualization).
+- A: Blank notebook to be completed after you watch the respective tutorial of the [digital course](https://courses.resolvingpython.com/).
 - C: Blank notebook to be completed as a homework.
-- B & D files are the solutions to the previous notebooks. If you want them, you need to buy the digital course.
+- B & D files are the solutions to notebooks A & C, respectively.
+
+❌ If you copy-paste the solutions, you will not learn anything.
+
+✅ **It is very important you work on the notebooks as we explain in the [digital course](https://courses.resolvingpython.com/) to acquire the mental models and the skills you will use in any other data project.**
 
 If you want to showcase your work on this course as a portfolio, don't forget to [fork this repository](https://github.com/jsulopzs/course-resolving-python-data-visualization/fork) to create a copy on your profile.