The Internet
The Internet is accessible to anyone who knows how to use the computer. Therefore, parenting could be pretty hard when your kid is computer literate. Why? Because everything is in the Internet - from knowledge to sex and violence.
This point forward, you have to keep a close eye at what your kid is looking at in the Internet. One thing that you could possibly do is to install something that would monitor the websites that your child views. There are a lot of kid friendly browsers out there that are very easy to use and cost only a minimal fee.
Remember, that minimal fee can spell the difference in the life of your child so make the right decision and guard him from the violence of the Internet.