Riding in the rain does not have to be dangerous, but it is more so than in the dry.
Your traction is reduced, so being careful in turns is not a bad thing. If new, your probably being a little over cautions, but that is a good thing.
Worst time for riding is right after it starts raining, roads are slicker since all the material that was "stuck" to the roadway gets lifted off and becomes slick, especially in the middle of the lanes and on turns.
Braking distance increases when wet, tires lock up easier in the wet. Most of your braking should still be done with the front brake, but know the limits of your front brake. Locking up the rear is bad when dry, but can be dangerous when wet, the rear will whip around much quicker. I for one always use engine braking when slowing down, dry or wet, so I am used to it, but if not experience, can also cause issues.
For gear, if you plan on doing a lot of wet weather riding, get some good stuff. A regular raincoat will not work with the ergonomics of a bike.
For me, I am a whimp, if I am going somewhere that I need to stay dry and their is a chance of rain, I cage it. I don't have dedicated rain gear.
I do ride in the rain a lot though when I am just out riding. I don't mind getting wet or riding in the rain, but only if I don't have anywhere to be (or am on my way home from somewhere).
Biggest issue with highway riding in the rain is mist from other vehicles (especially semi's) that can coat your visor/windshield quickly and loose visibility.
Here is a decent video with some tips: