Save your computer from hacker

Every sites,computers or maybe servers can be hack by hacker
How it works?
They look for a port that opened and they will attack it
The Point is hacker always trick you from your opened port
Why don't we just close our port?
how?
okay...lets start the lesson
say that a port is a door in your house.a visitor can come inside from the door..and you can go outside from that door too.
ex: if your surf to www.chandra-kusuma.com , a port in your computer will open in random and chandra-kusuma server port will opened too
now..like the question...close the port ?
okay...you can close the port but the port is the door..so you can't go outside and a visitor can't go inside
the easiest way is unplug all of your connection cable so you can't go outside and nobody can go inside
or maybe just shutdown your computer

Lesson finnish