Guitar Repair Help

Recently my acoustic guitar has started giving me a little problem. When I play the second fret of the third string there is a slight buzzing sound. That is the only note that I’ve had any problem with and I was wondering if anyone has any solutions as it is a bit annoying.

I’ve never done any guitar repair so I don’t have a clue where to start.

The guitar is an Ibanez AE, if that makes any difference.

Thank you for any help!