How to block and replace the Website on aPC..?

My computer=> C drive => Windows=>System32=>drivers=>etc=> host file

Open host file in WordPad or notepad

Now open CMD and type in CMD ping www.google.com then copy the IP Address of Google website

In host file just write the IPaddress of Google website that you copy and name of the website which one you want to block.

Like:
87.248.112.181 www.facebook.com

in this case you will type in URL www.facebook.com but Google website will open.

for block:
type 127.0.0.1 www.facebook.com or www.yahoo.com

it’s not going to open which one you will type.