Thank you for your contribution @ideba.
After reviewing your tutorial we suggest the following points listed below:

• Your tutorial is quite short for a good tutorial. We recommend you aim for capturing at least 2-3 concepts.

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

• The screenshots of your mobile phone are very large. Only place screenshot with content.

• We suggest that you ident your code. It's not necessary to give many breaks of lines between the lines of your code.
  

Looking forward to your upcoming tutorials.

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