Thank you for your contribution @duski.harahap.
After reviewing your contribution, we suggest you following points:
Use the third person in your entire tutorial. It becomes more professional to be consistent during the whole contribution.
Good explanation of your code, but in some sections of code it would be important to have comments.
Your print screens are quite professional. Good job!
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!