Host file is a computer file used to store information on where to find a node on a computer network.
By editing this file you can easliy block sites
1. Press Window key + R .
2. Type cmd and press Enter.
2. This will open a DOS command window.
3. Type: "notepad C:\Windows\System32\drivers\etc\hosts" and Press Enter.
4. Locate the line 127.0.0.1 localhost
5. To block the website google.com for example, just add this text under 127.0.0.1 localhost:
127.0.0.1 google.com
127.0.0.1 www.google.com
You can add as many sites any site, However you will need to prefix it with "127.0.0.1".
6. Save the file
Google will now be blocked in all web browser. This is an advanced but easy method on how to blow a website.