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so, first of all i dont care if my employer knows about my job. first job is full time at 27,500 and my second should be part time at 21,840. so I dont know if that puts me in a new tax bracket or not.

second, I am not married so that would not be a factor right now. 

but I dont know anything about taxes or w4s. I am 21 and I have never been taught how to properly do this. Thats why I am asking how I should do this so that i dont end up owing thousands of dollars or getting in some kind of trouble with the IRS.