ANSWER: The best is to sit in the same spot and do your adkhar but you’re not sinful if you change the spot.

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ANSWER: It’s valid.  Isha (4 rakah) is valid and witr is not part of isha. https://youtu.be/ny73kP0XSSs

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ANSWER: Pray 1 more rakah and do sujood as sahu after salam and make another set of salam after sujood as sahu. If you did not do that, your prayer is invalid and you must repeat it now. 

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ANSWER: You should dry spit and you can dry spit at your left foot when in congregation when a person is standing to your left.

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