Have you ever been kayaking, or using a kayak to move in water?
No, don't really know much about it. is it dangerous?
No it is safe if you can swim and wear a helmet. It is distinguished from canoeing by the position you sit in and the number of blades on the paddle
What about white water rafting
Never did that but I have done whitewater kayaking. It was intense to paddle my kayak on whitewater rapids.
is there any tips to get good at kayaking? 
Yeah get a kayak with a closed deck and a sit-on-top orientation. That way you will have more maneuverability in the water.
Hmm, is this a good time to bring up I don't know how to swim. So what if I capsize???