I just finished the hat
1 The C8F means when you get to that point, you put 4 stitches to your cable needle, lay it forward, knit the next 4, then knit the 4 on the cable needle and go onto your pattern from there. Laying them forward then knitting them after is what makes the twist effect.
Does that help? What is confusing you?
Once you get going, you jones for the next cable to come up!