|So i went to cmd, type netstat -ano. the video says that " if anywhere there it says 'established' then u have a hacker"..|
Ignore the video, it's talking rubbish. Established means just that, you computer has established a connection with a remote computer, something you do on the Internet all the time. You will even see it if your computer established a connection with another computer on the LAN. The only way never to see Established is to disconnect from any network completely.
It is very difficult to target a specific computer unless the hacker has planted a Trojan. If you suspect you are being hacked that is the first place to start looking.