I want to learn your suggestions about that:
Using commas for product’s categories

OR Creating a 3rd table.

Which one is more useful?
Thanks alot for your suggestions.
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Creating a 3rd table is definitely the better option.
Using comma-delimited values is only going to cause you problems later down the line. It will also make writing SQL queries a lot more complex than they need, and the performance will be costed for this.