You can have all the answers to these questions by first learning the Quran and sunnah with the understanding of the salaf and then you will know who is deviant and who is not. Kindly refer the following: https://www.youtube.com/watch?v=BQI_2TuQ0-g

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If one does not know Arabic, s/he can make general dua’a in their mother tongue in sujood or before Salam. It does not break salah.

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