The biggest thing I've noted when stepping down from a larger bike is the basic handling characteristics. The 310 will lock up brakes quicker due to less weight holding it down on the road, and this goes twice for off-road. If you don't use your front brake as your primary stopping force, you just may overshoot some corners as a result. The same hold true for rough road, like larger stones, rain ruts. The 310 is light & will be bounced around much more than the heavier bike you're used to. If you don't slow down, you will begin skipping across the surface, basically at the mercy of inertia & gravity. The heavier bikes let the suspension take the brunt & keep the wheels in contact with the surface better.
Yes, the basic for street riding is EVERYONE REALLY IS TRYING TO KILL YOU. Always expect they will pull the dumbest move they possibly can to put you in harms way. Most often for me it is traffic merging onto highways. They don't want to bother with looking any further than a glance in their rear-view mirror. Always assume they didn't see you, and plan your escape route.