Tell your Dad. It's not something you did unless there's something you haven't told us. He might be able to fix it or he might call an electrician. But don't you try to mess with it unless you're sure you know what you're doing and meaning no offense if you have to ask this particular question here you're not sure of that.

If you want to know how to deal with it going forward, ask whoever fixes it if you can look over their shoulder and ask questions, and if they say OK, then look over their shoulder and anything they do that you don't understand, ask questions. But don't do that until you're sure they're OK with it--some tradesmen love to take a teaching opportunity, others don't like to be watched.