2) Yes. If you realized that you made a mistake in Fateha, before going to Rukoo, then you need to correct it, and repeat the second surah.
So its same when its about the other zikr like the ruku or sajda zikr ? If I do mistake of makhraj, I just repeat it?
1) And, if we not correct it, it will not invalidate our salat right?
2) For example, if I noticed it , but I am still praying.
Like if I did mistake in surah Fateha, and I noticed it when I am reciting surah ikhlass, no need to break the salat.
Is it like this please?