The Sunnah is to offer 11. You can add more to that. Praying less than 11 is permissible but you will lose the reward

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It is not mandatory but it is highly recommended.

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It is permissible to pray loud of these Sunnah prayers but is it not recommended. As for “Tahiyatul-Wadhu”, I don’t know what that means.

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This would be an innovation. You can only make Du’ah and ask Allah for whatever you want.

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