After analyzing your tutorial we suggest the following points below:Thank you for your contribution @duski.harahap.
The subject of your tutorial how to read a CSV file and how to read and write a Json file already exists many online tutorials. It's a relatively easy subject, yet it's always good for users to know these concepts.
Your tutorial is very well structured and with good demonstration of the results of the developed code.
Thank you for your work in developing this tutorial. We are waiting for your next tutorial.
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thank you @portugalcoin :)
Thank you for your review, @portugalcoin! Keep up the good work!