Using arduino digital PIN 0

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hello! i'm newbie in world. met arduino week ago.
some people including me having problem using pin 0 input.
i have arduino uno r3.
as specification, pin 0 , 1 can used input , output if not using serial functions. many times not work. tried, can't find information it.
i tested pin 0 push switch , found works pull switch.
but pin 0 stays high pull down switch.
many people use 10k resistors switch. pin 0 not work pull down switch using 10k resistor. , if make pull down switch resistors resistors lower 10k, works on pin 0. ( used 5k resistor)

]:)  think circuits in aduino make pin 0 has higher voltage.
:smiley-eek-blue:  i'm not @ electronics, not sure safe arduino.  :smiley-eek-blue: ok?

pin 0/1  uses when u upload programs, nothing should connectet... (upload problems)
your program should not contain "serial.begin"-statment


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