de0-nano ADC reading, help me please)

Hello! I`am a newbie here..

Can you help me with ADC reading on de0-nano?

Is it necessarily to use ADC-controller when programming FPGA if i don`t want to change something in adc converting?

Can I read directly digital values from ADC on input FPGA pin (like I can use 50 Mhz from CLOCK_50 input)

in block diagram?

whether will work if I choose ADC in System Builder? is it enough of it for ADC work?