After reviewing your contribution, we suggest you following points:Thank you for your contribution @duski.harahap.
In your next tutorial put comments in the code sections. Users with less experience have more difficulty interpreting code and a brief explanation in more complicated code lines helps always.
Use only the third person in the text of your tutorial.
Try to improve the structure of your tutorial.
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!