Reciting the Fatiha is sufficient but if there is enough time, you should recite a surah.

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The best way is to pray it in the last third of the night, 2 + 2 ….. etc and when you come to witr, you pray 2 + 1.

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It is permissible to offer 100 rak’ah if you wish. There isn’t any Sunnah in this regard.

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