First you need an Internet service provider, If you dont have one you will have to get one first. You have two options of of what we call broadband internet connection.
One is ADSL, the other is fiber optic cable.
After you have this depending on what you select you will be given a modem Router.
Where you will have the choice of how your laptop connects to it to get the internet.
The first can be wired through what we call an ethernet port from the laptop to the router via a cable, or if the router supports wireless transmission and the laptop you are using has a wirless ethernet adapter fitted you can connect to the internet that way.