ANSWER: Witr is not mandatory.  Your isha is not effected by this.  It is a highly recommended Sunnah. The Prophet salla Allahu Alaihi wa sallam used to never miss witr and the 2 rakahs Sunnah of fajr even while he was traveling, but this is not mandatory. 

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ANSWER: No problem in leading the prayer and what you have heard about dua is not correct.  You’re sinful for not removing pubic and armpit hair for more than 40 days but this does not affect your prayers or duas.

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ANSWER: No problem, but you would lose a great deal of reward if you don’t pray the 12 emphatic sunnah prayers but you’re not sinful and your prayers are valid.

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ANSWER: If he didn’t pray the second ruku with the imam, he has missed the Friday prayer and he must pray 4 rakah after the imam offers salam as his dhuhr.

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ANSWER: No problem. https://islamqa.info/en/answers/126258/qunoot-should-be-said-at-times-of-calamity-with-a-supplication-that-is-appropriate-not-with-duaa-al-qunoot

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ANSWER: What you have heard is absolutely wrong.  No problem in doing other activities during athan including praying. The best however is to reply to the athan and recite the prescribed dua after it but this is not mandatory. 

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