Samsung

I have a simple question which I hope has a simple answer-- is there a way to custom set notification sounds, ringtones, and other sounds on this phone? It's my first smart phone (yeah I know, I'm behind) and it seems like something pretty basic.

If it can only be done through an app can someone recommend a simple one? I really just want to be able to use my own wavs or mp3's. I did find an app which allegedly changes the ringtone but it only seems to do ringtones, and I'd rather something that let me add notification and ringtone sounds.