Thank you for your contribution @duski.harahap.
After reviewing your contribution, we suggest you following points:
Tutorial interesting and well explained, however it is necessary to improve the structure of the contribution.
Again, it's necessary to put brief comments in your code sections. Code comments help less-savvy readers better understand your lines of code
Your GIFs are very intuitive, good job!
Thanks for following some of our suggestions in your previous tutorials. We hope your next tutorial is better structured.
Thank you for your work in developing this tutorial.
Looking forward to your upcoming tutorials.
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Thank you for your review, @portugalcoin! Keep up the good work!