Thank you for your contribution @duski.harahap.
After reviewing your contribution, we suggest you following points:
Excellent tutorial again. Good work in developing this contribution!
At the end of your tutorial you used the first person and you should have always kept the third person to have a coherent text.
Nice work on the explanations of your code, although adding a bit more comments to the code can be helpful as well.
Using GIFs to show results is definitely better than standard still images.
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!