When riding in groups, always allow enough space between you and the next rider by staggering your position to the rider in front.
Always keep your eyes on the furthist point of the road for safety. This will allow you time to set up for the bends and see hazards early.
Use ALL of the road when it is safe and legal too. Positioning yourself to the left of the road in right hand bends will allow you to see the exit point earler that any other position. Position yourself on the crown of the road for left handers but watch for oncoming traffic.
Read the road conditions.
Learn to tell the signs of oil and diesel spillages on the road.
On wither days look out for puddles and damp area's under trees ,where the weak sunshine has not dried the roads.
All in all ride safely and enjoy yourself ,biking is fun but dangerous too.