Q: accessing internet on Apple TV4

1.  Can I view everything I view on the internet on Apple TV 4?

2.  If so, how can I set up either apple tv or the computer to give that access without jeopardizing my securities?

3.  I have Apple Share turned on but still not all to access my iTunes purchased tunes on Apple TV4.  I did finally get You Tube to work.

It just seems I don't have much access to internet materials on Apple TV4 or essentially no access to internet materials and need to know what I need to turn on to give access without destroying my securities.