Invoice numbering

When preparing invoices, they are not numbered. What is the problem with that?
What is the method of numbering sales invoices?

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Brother Syed, I thank you for your explanation. But I wish you would explain the method to me in Arabic. Thank you

The forum is English only. You can go the links provided by @Syed_Salman_Ali and copy and paste the text in a translation application such as google translate: