ANSWER: It’s mandatory for men to pray in congregation at the masjid. This is for women who pray at home or for someone who cannot attend masjid due to a valid reason.

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ANSWER: We cannot know but must have good hope in Allah as Allah is as His servant thinks of Him.  https://islamqa.info/en/answers/107701/conditions-of-the-validity-of-prayer

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ANSWER: You must stand right behind the imam and then to right and then left so that the Imam is in between the congregation. 

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