Thank you for your contribution @duski.harahap.
After reviewing your contribution, we suggest you following points:

• Nice work on the explanations of your code, although adding a bit more comments to the code can be helpful as well.

• You have sections of code that aren't indent. Be careful to indent the code.

• Don't mix using the first person in your text and then the third person. Be consistent and always use the third person in your text.

• 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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