But the manual doese´t shows the default connections for 16F872, what are the defaults for my PIC?

Can i want use RB1 to RB6 insted och the default or does i have to use pin´s from outher ports?

btw why does the PIC have diffrent ports like PORTA, PORTB, PORTC..

And yes i´m new to PIC programing and i have just get my LED to blink when i push a button