Battery usage

[Emma1984]

Hi there..Wondering if someone can help me please!
My battery life is rubbish for some reason. Was pefect when i first got the phone about a month ish ago. When i check my phone the most usage is..

Wifi... 33% ( i perume i just turn this off when not in use and should drop?)
Cell standy.... 30% battery used by cell radio... how do i turn this off if i can?

Phone idle.. 29%.. whats tha?

Please reply in simple words and meanings lol