Probably one of the best tips I ever got which served me well in group riding is the bike always goes where the eyes are looking!

My riding partner always had to look at me while riding beside me and talking, she scared the bejeebers out of me! She was always turning into my front wheel.....I had the hardest time breaking her of that habit!

Always keep a straight line, if you do need to swerve to avoid something in the road, shout it out, point it out to those behind you and gradually move around it don't abruptly swerve! Keep your eyes on the wheel in front of you while scanning the road ahead, can you say multitasking? LOL

Keep a safe (at least a wheel distance) behind the person in front of you and slightly to the right or left of their wheel. Unless in a pace line then you want to be within inches of their wheel which involves a lot of skill and mostly TRUST of the abilities of the riders in front of you!

Okay....it makes me want to go ride...