which SPI mode Should I Use ?

Using Arduino Programming Questions
1

the data sheet says

"The Clock phase should be configured so that data is centered on the first positive going edge of the
SCLK period and the polarity should be chosen so that the SCLK line is low in idle state"

Can anyone suggest me which SPI Mode should I Use?
And What is the default One?

2

anilkunchalaece:
"The Clock phase should be configured so that data is centered on the first positive going edge of the
SCLK period and the polarity should be chosen so that the SCLK line is low in idle state"

Have a look here for a visual representation of CPHA & CPOL.
SCLK idle low = CPOL0
Data centred on rising edge = CPHA0
The SPI reference here says that's SPI_MODE0 that I think this is default though the documentation does not say that.