Tab and Space Keys:

This is a funniest tip...!

when you are browsing on internet.You may ask to sign up and fill some application when you are trying to get information from particular website.
When you are filling your forms.For eg. Your name,address,sex etc.,
You need to use mouse to move the cursor to next box.It makes us irritate.So use tab keys.
It makes the cursor to move to next box.Then,u may ask to mark the small box 0r circle .
For eg.Male or Female.No need to use mouse here just press the space key and select it.

Good Luck...!