I want to seek knowledge but get confused by claims that specific ppl arent reliable.Why not try unite the ummah instead of division?If new,how to seek knowledge without this problem, if i dont know the terms to detect falsehood(eg, takfeeri/suroori) why necessary if ppl have mistakes,not big flaws?

I would encourage u to focus on learning we have more than 300 lessons in the academy, keep learning and focus on them alot and with time thos will be much clearer to you, in sha'a Allah. Remember the Prophet warned us against bida' therefore the people who fall into them or advocate them are warned against and this is part of oir deen.