ANSWER:

If you’re about the finish this sunnah prayer when the iqama is called, you must quickly finish it and join the imam before the first takbeer. However if there’s more time to finish and you’re afraid you will not be able to finish it before the first takbeer then you must break your sunnah and join the imam. 

In the mosque while i just started the sunnah prayer or I am in the middle of my sunnah prayer the ikamah was given should I stop/exit from my sunnah and join the congregation what should I do?

Prayer | April 1, 2018 7:10 am
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I wear the skull cap whenever I go out of the house (for salah or otherwise)but inside the house I do not wear it.(Because my mother dislikes it). I saw your video where you said it is an innovation. So, if I go to masjid wearing the cap is it still innovation ? I mean I am wearing it because I want to look Muslim, not because I am going to pray.
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In Salah, if I recite complete Surah Fatiha twice in 1 rakah, that means I have added something to the prayer and I have to perform 2 sujood as sahw after tasleem. Is it right? Do we have to say the azkar (like, rabbig firli) between the 2 sujood as sahw?