How to prevent Hacking of computer

There might be so many people around the world who have been hacked by anyone but many of us might don't know this the he/she has been hacked.......The way we can make ourselves protected from hacking are very simple we need to follow them.....
We Should not save passwords onto our machine...
We should not tell our ip address to any one....
We Should download softwares from the official websites of those softwares ...not from other websites
We shoul try not to download games,Songs,movies from internet...Instead we should Buy original Dvd's from market...because we can be hacked using those downloaded things.......
Hacking using downloadable things is most eassiest