Is the du’aa’ of Witr obligatory, and what should a person say if he cannot memorize it?

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Check below answers in case you are looking for other related questions:
Numbers of rak’ahs in Taraaweeh prayer
Praying Taraaweeh at home/putting cream on the body when fasting

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Related Answers:
Can he pray Witr twice in one night if he prays after the imam?
The last ten nights of Ramadan begin from the night before the twenty first day, whether the month is complete or not
If a person prays some of Taraweeh with the imam then prays Witr and leaves, will it be recorded for him as having prayed qiyaam al-layl?
Numbers of rak’ahs in Taraaweeh prayer
Praying Taraaweeh at home/putting cream on the body when fasting

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