LED CON 0 doesn't clearly map the LED to a pin.
LED VAR GPIO.0 does. Just easier to understand.
I like to put a pinout connection diagram for the chip as a reminder what is connected to what. It also helps when asking a question.
Similar to this example
Code:
;
; Target Controller - PIC16F628A
; __________
; d6--RA2 |1 18| RA1--d5
; d7--RA3 |2 17| RA0--d4
; LED-------RA4 |3 16| OSC1--------
; +5V-----------!MCLR |4 15| OSC2--------
; Ground----------Vss |5 14| VDD---------+5 V
; gps in-----RB0 |6 13| RB7---------
; ---RB1 |7 12| RB6---------
; ---RB2 |8 11| RB5--e
; pbutt--RB3 |9 10| RB4--rs
; ----------
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