First time ride advice
With respect to riding in a group, or with more numerous riders closer to you than you are used to.


Be aware of the space around you
Maintain a safe distance from riders in front
Look sideways and over your shoulders before overtaking or maneuvering
When cornering be aware of riders to you sides and give them space
When slowing down, hold up a hand palm forward, or call out 'slowing' or 'stopping'


Common sense stuff really.